As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - A BURNING ELECTRICAL SMELL WAS REPORTED EMANATING FROM THE AVIONICS BAY. FOUND TO BE THE NR 2 DISTANCE MEASURING DEVICE RECEIVER. DEACTIVATED SYSTEM. REPLACED DME INTERIGATOR ON FOLLOWING DAY (9-20-00). OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.