Amica Dw ZWM616 PCB blowing.

Had an emergency call to this job on Christmas eve, I slotted it in on an extremely busy day as a favour.
The machine was dead as a dodo, I replaced the PCB and ran it through a quick load test etc. All was wll so I cracked on.

Customers phoned back (and will no doubt be in touch asap) saying it’s dead again. It’s worked for four or five days though.

Something popping the PCB’s I assume, has anyone come across this before or have any ideas?