As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BNA - CLT - ELECTRICAL ODOR - UPON AIRCRAFT ARRIVAL IN DCA, NOTICED ELECTRICAL ODOR IN COCKPIT AREA {ONLY COCKPIT AREA - CABIN OK}. BURN MARKS FOUND ON BOTTOM OF NR 2 MULTI-MODE RECEIVER (MMR). REMOVED AND REPLACED NR 2 MMR. LAND CAT 3 CAPABILITY TEST WAS SATISFACTORY.