it's the relay module inside the top of the dryer, next to the timer switch. Part number 91201247 (do a Google search). You need to disconnect from the mains, to take off the top (three screws at rear),remove the plastic piece, and slide the top to the rear of the dryer, and lift off.
Pull the timer knob off the timer (quite difficult to get hold of).
Undo the two screws holding on the plastic front. Remove the led for the 'on' light, and slide the plastic front to the right to remove it.
Remove the two screws holding the metal to the frame of the dryer at both sides of the top.
Now you need to remove the front.
Remove the four screws from the bottom of the front panel of the dryer, and the eleven around the door opening. Not the ones by the hinges, or the door closer.
The plastic front will be supported by the wires from near the button panel.
You will probably need to cut off the plastic support for the wires to make them long enough.
The front can now be moved to give you access to the two screws holding the relay module to the chassis.
Swap the wires on the module on a one for one basis, and re-assemble everything (in true Haynes car manual style), in the reverse order.
Good luck.
Wombat, August 2007