[求助]中继线被锁问题！...

机型：北电11C

进线中继一直被锁，状态如下：

00 = UNIT 00 = BUSY            (TRK)(CO LOP )
01 = UNIT 01 = LCKO            (TRK)(CO LOP )
02 = UNIT 02 = LCKO            (TRK)(CO LOP )
03 = UNIT 03 = BUSY            (TRK)(CO LOP )
04 = UNIT 04 = IDLE            (TRK)(CO LOP )
05 = UNIT 05 = IDLE            (TRK)(CO LOP )
06 = UNIT 06 = BUSY            (TRK)(CO LOP )
07 = UNIT 07 = LCKO            (TRK)(CO LOP )

请大家帮忙分析被锁原因，感谢！