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@Grumpy_Git
Do the neighbours have a system you could check?
Are there external buzzers?
Can you take a photo of the back on the circuit board to trace the lines 0r check for cracked boards?
Does the handset work for speech both broadcast and receive?
In my experience cracked pcbs or the cables to the handsets are what fails. Both can be traced with a multimeter on resistance.
Remove the handset and check the resistance between the four pins TO THE HANDSET.
M-C
C-C
C-A
M-A would expect infinite.
Also check for continuity between 1,2,6,CA on the screw terminals and M,C,C,A on the handset connector