Could well be a fly-back diode to the pcb relay has gone up the swanny then? I replaced mine recently with beefier diodes just on the chance that they'd fail at some point in the future.
Agree. I have never had a close look at one, but typical wiring diagrams suggest that the only electronic components on the pcb are diodes. No hi tech microprocessors or anything like that. A fly-back diode is only there to supress sparking across the switch terminals when an inductive load is switched off. Simple and cheap to replace if you are handy with a soldering iron. If not, i would be tempted to seek out “a man that can” (oops, or woman!) rather than wait for ever. A friend of mine with a similar issue simply wired the lamp direct to a new separate switch .
