What was found
FOUND ACFT DOOR CLOSED AND ACFT WITH A STRONG ODOR IN MAIN CABIN, APU WAS ON, BLEEDS OFF, NO GROUND AIR. PERFORMED TSM 05-50-810-831-A, TYPE 2 AND FOUND THE APU WITH OIL LEAKING AT THE PRESSURE SWITCH. RAN THE NR 1 AND 2 ENGINES WITH PACKS ON IAW AMM 71-00-00. NO ODOR NOTED OR DEFECTS. R & R THE RECIRCULATION FILTERS IAW AMM 21-21-41.