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Most likely it's the triac (the component mounted to the heat sink) that's gone bad. Shouldn't be a problem to locate a replacement. The potentiometer shouldn't be carrying any load to speak of and will be fine unless another component has failed and taken it out in the process. Can you post some pics of the circuit board? Also, see if you can read the number on the triac.
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David Dryden
'86 911 Coupe
'05 BMW X5 4.4i
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