What was found
DURING CRUISE, BOTH RECIRCULATION FANS WERE TURNED OFF FOR AIR RECIRCULATION JUST AFTER THAT A ELECTRICAL SMOKE ODOR BEGAN IN ALL THE AIRPLANE IMMEDIATELY RECIRCULATION FANS WERE TURNED ON AND ODOR DISAPPEAR. WERE CHECKED FWD APU AIR DUCTS AND CHECK VALVE APU AIR AND FOUND OIL CONTAMINATION WERE CLEANED SYSTEM OIL CONTAMINATION IAW AMM 21-00-21 PAGE 201 AND ADDITIONAL WERE CHECKED PANELS 31, 32, 34, 35, 36 AND P37 AND FOUND IN NORMAL CONDITION IAW WDM 24-51-1324-21-11,21-45-11 AND 21-45-21. PACKS WERE OPERATE WITH APU AND ENG, AND NO ODOR TO OIL OR WIRE BURNED WERE DETECTED.