If you want to check the PGM for burnout, remove the tailpiece and the PGM, then take the lid off the PGM and check the rubber goo for charring marks. If you see any evidence of overheating, then DO NOT run your bike until you've solved the issue. You will destroy the PGM.

Assuming the best, and that the PGM is only just gone, then it is possible to replace the transistors which supply the current to the servo motor.

Take the lid off, and post us a photo of the insides. From that we should be able to tell you if it's toast!
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