Lectrician
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Faulty modules would not cause an issue with the serial port connection. I assume the lead is plugged into the correct programming port in the CCU and has not fallen out? The serial port is working on the PC? Not firewalled, the port number been changed etc?
How many lines are you using, and are they all having the same problems releasing the lines? If you are using just 1 or 2 lines, swap the two black modules around. This would prove if it is the module or not.
Standard PSTN lines do not like working directly with the versatility with out the line supervision guarded clear set to on. When a PSTN line is correctly presented by BT Openreach for PBX use, you would not require this setting, but these days when lines are installed they just present standard PSTN lines when they are ordered. Usually if you order a line and an auxiliary line (a second line on the same number), they will be set to the type required for use with a PBX automatically, having the guarded clear setting on the line, rather then system.
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