What was found
ODOR OF ELECTRICAL BURNING COMING FROM THE AIR VENTS AT ROW 31 DURING CRUISE. MAINTENANCE INSPECTED THE AIRFRAME & CABIN FOR ODORS IAW AMM 05-50-00-810-831A. INTERIOR CABIN FWD & AFT CARGO BAYS, AVIONICS BAYS, ENGINE RUN WITH NEGATIVE RESULTS. CREW NOTED NO ODOR, SLIGHT ELECTRICAL ODOR. PERFORMED PERIODIC CHECK IAW T/C FFT-M05100-M0-1. PERFORMED OPS CHECK FLIGHT, NO ELECTRICAL ODOR NOTED IAW AMM 05-50-00-810-831A. PERFORMED A WALK AROUND, NO DISCREPENCIES FOUND. AIRCRAFT RETURNED TO SERVICE.