Posted to the Waveform Library on 5/4/2012

Here is the small circuit board that you will need to remove to perform the repair. Pull off the temperature control knob and remove the retaining nut and washer (on the front side of the heater control unit). While lightly pushing on the temperature control stem push the two retainers off to the side and pull the circuit board out of it's position (just use your fingers and do one retainer at a time, no screwdriver needed).

Eric from Wisconsin