What was found
(AIRCRAFT NOT GROUNDED) DIRTY SOCK ODOR REPORTED FROM BOTH FWD FA'S AS SOON AS DOOR OPENED. FOUND LUBE MODULE FILTER LEAKING, APU COOLING FAN LEAKING. SAW POSSIBLE LEAK OF FCU BEFORE APU RUN, BAGGED FCU & RAN, FOUND NO VISUAL LEAK. CONFIRMED LEAKS AFTER RUN. DURING CHECK FOUND EVIDENCE OF OIL LEAKING FROM APU FCU DRAIN PORT & OIL COLLECTING AT BOTTOM OF MODIFIED FIXED AIR INTAKE DUCT. REMOVED APU IAW AMM 49-11-11-000-004-A. CLEANED APU BAY WITHOUT APU INSTALLED IAW AMM 49-00-00-100-805-A. CLEANED APU AIR INTAKE AND/OR AIR INTAKE DIFFUSER & ELBOW IAW AMM 49-16-00-100-005-A. INSTALLED SERVICEABLE APU IAW AMM 49-11-11-400-004-A.