As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING ROUTINE SERVICEABILITY CHECK, WITH GROUND POWER APPLIED TO AIRCRAFT, STRONG BURING SMELL NOTICED IN AIRCRAFT.GPS RECEIVER DISPLAY WENT BLANK. (GPS KLN 90B RECEIVER) SUBSEQUENT INSPECTION FOUND & CONFIRMED BURNING SMELL ORIGINATED FROM GPS RECEIVER. RECEIVER REPLACED AND AIRCRAFT RETURNED TO SERVICE.