As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - FLT 1681 - EN ROUTE ROC-ORD, AFTER LANDING ORD, DETECTED STRONG ELECTRICAL BURNING SMELL AT AFT PASSENGER SECTION. ODOR RAPIDLY DRIFTED FORWARD AND DISSIPATED AT GATE ARRIVAL. REPLACED AFT RECIRCULATING FAN. ACCOMPLISHED PACK BURNOUT PER THE MM. NO ODOR NOTED. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)