What was found
AIRCRAFT WAS NOT GROUNDED: PASSING THROUGH 10K FT, SMELLED AN OILY MUSTY ODOR, AFTER LANDING & AT GATE, ODOR INTENSIFIED. APU TURNED ON AFTER LANDING & ODOR OF OIL/MUSK INCREASED MORE. AFTER OPENING DOOR, ODOR DISSIPATED BUT REMAINED EVEN AFTER DOOR REMAINED OPEN. CLEANING CREW & GATE AGENT ALSO SMELLED DIRTY OIL/SOCK ODOR AFTER BOARDING. MAINT FOUND APU OIL COOLING FAN LEAKING OIL & REPLACED IAW AMM 49-52-51. MAINT FOUND THE APU GEABOX VENT LINE HAD EVIDENCE OF COKING & REPLACED LINE IAW AMM 49-26-54. (AALA202511075785) MAINT ACCOMPD A DECONTAMINATION OF THE ENVIRONMENTAL CONTROL SYS WAS ACCOMPLISHED PER TASK CARD 26L00021014. A SATISFACTORY LEAK / OPS CHK WAS ACCOMPLISHED WITH NO ISSUES OR ODORS NOTED.