What was found
ELECTRICAL BURNING ODOR IN CABIN PERFORMED SMOKE/ODOR IN THE FLIGHT DECK/CABIN - CONDITIONAL INSPECTION IN REF AMM 05-51-26-800-801-C1 UP TO STEP C (E)4. NO ELECTRICAL BURNING SMELL. COMPLETED STEP C (E)15, STILL NO ELECTRICAL BURNING SMELL. NO ELECTRICAL BURNING ODOR, AFTER REVIEW OF ACFT HISTORY, RECIRC FILTERS REPLACED. ENGINES 1 AND 2 IDLED FOR 15 MINS EACH, NO BURNING ELECTRICAL ODOR NOTED. AC OK TO CONTINUE.