AT&T System 25 - Manual (Page 270)

MAINTENANCE
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CO failure to release after PBX disconnect
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CO belated release.
These messages indicate CO problems. The first three errors are
very common when DID trunks are installed. The CO should be
notified through the proper channels about any of these problems.
The CO failure to release after PBX disconnect can frequently be
corrected by disconnecting and then reconnecting the DID trunk. If
this procedure does not resolve the problem, notify the CO through
the proper channels.
Check each DID trunk port suspected of being faulty by dialing in
with the touch-tone test set beginning at the network interface. (Be
sure to use the appropriate dialing mode, dial pulse or rotary.)
If the test call is successful at the network interface, the fault is
probably with the CO facility, and the CO should be notified through
the proper channels.
If the test call is not successful at the network interface, repeat this
test at the cabinet.
If the test fails at the cabinet, replace the DID circuit pack.
If the test call is successful at the cabinet but not at the network
interface, repair the trunk access equipment wiring.
Check the Error Log for any messages indicating unused
(inaccessible) DID trunks.
Switched Loop Attendant Console Troubles
Refer to Figure 4-13 for assistance in clearing Switched Loop Attendant
Console troubles.
Note: If problems occur after the LOCAL mode has been used,
activate the LOCAL mode again and recheck console
operation.
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