Barcrest Costa del cash no lamps qork

Hi guys.

I have a Costa del cash club and it has been working fine for years. Today I could smell burning and all the lamps had stopped working.

No fault alarms

All power supply fuses ok
Mpu5 shows no 34v
Mux5 shows green led
Machine works just no lights.

Cant find the source of the burning smell.....

Any ideas?