As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED STRONG ELECTRICAL SMELL BEGAN DURING DESCENT. ISOLATED TO RT UPPER DECK HEATER. NO ABNORMAL INDICATIONS, BUT BURNING SMELL RECURRED WITH RT UPPER DECK HEATER ON. DEFFERED RT UPPER DECK HEATER, M 10789 ASSIGNED PER MEL SEQ NR 21-18-2.