Bosch W/d WVF2402 Dryer motor

Been to this job Bosch Washer dryer WVF2402GB02.
Initial complaint not washing or spinning properly.
Found pcb fault at fault replaced and now working on this ok.

While testing found dryer motor not running properly.
Starts up fine runs at normal speed, then after five minutes it begins to slow down eventually stops (heater still working at this point) check supply voltage keeps dropping until it stops. Reset and try dry again motor will not run. Motor seems free and not jamming. :rolls:
Supply seems to be from pcb? customer did mention after he thought that the dryer timer did not count down?

Any 💡 please

Cheers
Steven