My AEG Electrolux T37400 vented dryer does not work?

The dryer works, but stops spinning after a few minutes (different length times), although all the lights stay on as when it was working. If I bang the machine, it starts working again.

Had an engineer round, who diagnosed that a relay on the PCB is sticking, and that is why banging the machine makes it work again.

But the cost of a new PCB is almost as much as a new tumble dryer.
Can I fix the existing PCB ?