MD150A 求助...

中继亮黄灯，没隔2、3天就会出现电话无法打入（此时仍可外拨）的情况，重启交换机后，黄灯熄灭，但5-6小时后再度亮灯，40-50小时后电话无法打入。
头疼死了。高手帮忙瞧瞧是什么问题。

日志：
-------------------------------
BMS - Version 3.3.0.12
WARNING MESSAGES

SYSTEM: EHL
Listed: Mon, 2007.12.03 13:55:47
Listing done ONLINE.

Type: ALARM

Last cleared: 2007-07-06 14:58:45

Alarm total counter: 209
Error total counter: 2729
POS CODE                                              D1D2 D3D4 ST                 TIME        NOTE
----------------------------------------------------------------------------
    1 DC   PROTECTION LEVEL CHANGED.                   3C00 A15B 99 ST.OMINP             00.00 ALARM
    2 DB   FEATURE PROTECTED BY FECU.                  AE16 0316 AE ST.TRINP             00.00 ALARM
    3 DB   FEATURE PROTECTED BY FECU.                  AE16 0317 AE ST.TRINP             00.00 ALARM
    4 DB   FEATURE PROTECTED BY FECU.                  AE16 0318 AE ST.TRINP             00.00 ALARM
    5 DC   PROTECTION LEVEL CHANGED.                   003C A15B 99 ST.OMINP             00.00 ALARM
    6 DC   PROTECTION LEVEL CHANGED.                   3C00 A15B 99 ST.OMINP             00.00 ALARM
    7 DB   FEATURE PROTECTED BY FECU.                  AE16 0312 AE ST.TRINP             00.00 ALARM
    8 DB   FEATURE PROTECTED BY FECU.                  AE16 0313 AE ST.TRINP             00.00 ALARM
    9 DC   PROTECTION LEVEL CHANGED.                   003C A15B 99 ST.OMINP             00.00 ALARM

Error Log
----------------------------------------------------------------------------------------------------------------------
POS CODE                                              D1D2 D3D4 ST                 TIME        NOTE
----------------------------------------------------------------------------
    1 06   SYSTEM POWERUP.                             0000 E135 FE SYS_INIT             00.00 ERROR
    2 31   INVALID MESSAGE IN STATE.                   0536 0901 DA ST.OPINP             00.00 ERROR
    3 31   INVALID MESSAGE IN STATE.                   40A3 2401 D1 ST.RSINP             00.00 ERROR
    4 31   INVALID MESSAGE IN STATE.                   40A3 2401 D1 ST.RSINP             00.00 ERROR
    5 31   INVALID MESSAGE IN STATE.                   40A3 5101 D1 ST.RSINP             00.00 ERROR
    6 31   INVALID MESSAGE IN STATE.                   40A3 2401 D1 ST.RSINP             00.00 ERROR
    7 30   INVALID MESSAGE AT SIGNAL INPUT.            06D8 0400 99 ST.OMINP             00.00 ERROR
    8 06   SYSTEM POWERUP.                             0000 E135 FE SYS_INIT             00.00 ERROR
    9 31   INVALID MESSAGE IN STATE.                   0536 0901 DA ST.OPINP             00.00 ERROR
   10 31   INVALID MESSAGE IN STATE.                   40A3 2401 D1 ST.RSINP             00.00 ERROR
   11 31   INVALID MESSAGE IN STATE.                   40A3 2401 D1 ST.RSINP             00.00 ERROR
   12 30   INVALID MESSAGE AT SIGNAL INPUT.            06D8 0400 99 ST.OMINP             00.00 ERROR
   13 31   INVALID MESSAGE IN STATE.                   40A3 2401 D1 ST.RSINP             00.00 ERROR
   14 31   INVALID MESSAGE IN STATE.                   40A3 2401 D1 ST.RSINP             00.00 ERROR
   15 31   INVALID MESSAGE IN STATE.                   40A3 2402 D1 ST.RSINP             00.00 ERROR
   16 31   INVALID MESSAGE IN STATE.                   0536 0901 DA ST.OPINP     01 Dec 16:00 ERROR
   17 61   TRUNK LINE ERROR.                           031C A022 AE ST.TRINP     02 Dec 06:45 ERROR
   18 31   INVALID MESSAGE IN STATE.                   4FA3 23EE D1 ST.RSINP     02 Dec 08:45 ERROR
   19 61   TRUNK LINE ERROR.                           0313 A022 AE ST.TRINP     02 Dec 08:45 ERROR
   20 31   INVALID MESSAGE IN STATE.                   0536 0900 DA ST.OPINP     02 Dec 09:00 ERROR
   21 31   INVALID MESSAGE IN STATE.                   0536 0901 DA ST.OPINP     02 Dec 09:15 ERROR
   22 31   INVALID MESSAGE IN STATE.                   0536 0900 DA ST.OPINP     02 Dec 09:15 ERROR
   23 31   INVALID MESSAGE IN STATE.                   0536 0901 DA ST.OPINP     02 Dec 09:15 ERROR
   24 61   TRUNK LINE ERROR.                           0312 A022 AE ST.TRINP     02 Dec 11:00 ERROR
   25 61   TRUNK LINE ERROR.                           0316 A022 AE ST.TRINP     02 Dec 11:15 ERROR
   26 61   TRUNK LINE ERROR.                           0315 A022 AE ST.TRINP     02 Dec 14:45 ERROR
   27 61   TRUNK LINE ERROR.                           031C A022 AE ST.TRINP     02 Dec 16:15 ERROR
   28 61   TRUNK LINE ERROR.                           0310 A022 AE ST.TRINP     02 Dec 17:00 ERROR
   29 61   TRUNK LINE ERROR.                           031A A022 AE ST.TRINP     02 Dec 17:30 ERROR
   30 61   TRUNK LINE ERROR.                           030F A022 AE ST.TRINP     02 Dec 19:00 ERROR
   31 61   TRUNK LINE ERROR.                           0314 A022 AE ST.TRINP     02 Dec 21:00 ERROR
   32 61   TRUNK LINE ERROR.                           031B A022 AE ST.TRINP     02 Dec 21:15 ERROR
   33 61   TRUNK LINE ERROR.                           0319 A022 AE ST.TRINP     03 Dec 04:45 ERROR
   34 61   TRUNK LINE ERROR.                           0317 A022 AE ST.TRINP     03 Dec 08:15 ERROR
   35 61   TRUNK LINE ERROR.                           031D A022 AE ST.TRINP     03 Dec 08:45 ERROR
   36 61   TRUNK LINE ERROR.                           0318 A022 AE ST.TRINP     03 Dec 09:15 ERROR
   37 61   TRUNK LINE ERROR.                           0311 A022 AE ST.TRINP     03 Dec 13:00 ERROR
   38 31   INVALID MESSAGE IN STATE.                   0536 0900 DA ST.OPINP     03 Dec 13:45 ERROR