What was found
DURING TAKEOFF, FIRST CLASS PASSENGERS COMPLAINED OF AN ODOR AND BUZZING SOUND ORIGINATING FROM THE LEFT SIDE CEILING. ALL COCKPIT INDICATIONS NORMAL. ODOR DISSIPATED AFTER APPROXIMATELY 10 MINUTES. MAINTENANCE FOUND APU INLET CONTAMINATED WITH OIL. SUSPECT OVER SERVICING. ALSO FOUND HYDRAULIC LEAK IN LEFT WHEEL WELL AT AUXILIARY PUMP LINE. SECURED LINE. LEAK CHECK GOOD. CLEANED APU INLET AND PERFORMED OPERATION 5088 AND 5089. NO SMOKE OR FUMES IN CABIN. AIRCRAFT OKAY FOR SERVICE.