HI Andy,My name is ***** ***** I will help with your question. The thermal cutouts will be on the back near the element they normally stop the drier heating but the drum will spin. If it is dead I would suspect it is the PCB have you had a look at the PCB.Are you able to send me a photo of the PCB.
The knob should pull off and there may be some screws behind the knob.
Thank you for the photo could I have a close up of r120 are you able to measure the resistance of it.