What was found
AIRCRAFT WAS GROUNDED: SMELLY SOCKS ODOR ON TAKE OFF AND CLIMB OUT. ODOR DISSIPATED THEN RETURNED AT THE GATE. MAINTENANCE ISOLATED THE SOURCE OF THE ODOR TO THE APU. ** ORIGINAL REPORT WAS AALA202305314447** MAINTENANCE FOUND EVIDENCE OF HYDRAULIC FLUID ON THE BELLY OF THE AIRCRAFT COMING FROM THE WHEEL WELLS AND GOING INTO THE APU INLET. THE CONSTANT SPEED MOTOR GENERATOR IN THE WHEEL WELL WAS FOUND TO BE LEAKING AND WAS REPLACED. MAINTENANCE ALSO FOUND EVIDENCE OF OIL LEAKS IN THE APU COMPARTMENT. THE PRESSURE RELIEF VALVE CAP ON THE APU LUBE MODULE WAS FOUND TO BE LEAKING OIL AND REPLACED THE CAP (AALA202307283041). ALSO FOUND THE APU GEARBOX AIR /OIL SEPERATOR ADAPTER O-RING LEAKING AND REPLACED IT. (AALA202307282027) MAINTENANCE ACCOMPLISHED DECONTAMAINTION OF THE ENVIRONMENTAL CONTROL SYSTEM. A SATISFACTORY LEAK / OPERATIONAL CHECK WAS ACCOMPLISHED WITH NO ODORS NOTED.