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They have all worked before. They stopped functioning at different times.
However, last week, our power went off due to a network fault, but when it came back on it cycled the power two or three times within 1 second. The result of this was that another TM13 RF module and a power supply from my printer buffer blew.
Quite often it's the VDR that pops when you get a power surge, but it generally takes a few other components with it and damages the PCB.
Is there any smell of burning? If so, this is probably what has happened in which case I would not try a repair, even if you can find the component values (I've tried to get schematics before with no luck).