What was found
ACFT HAS HEAVY ODOR FROM AIR FILTER, APU SYSTEM. OPERATED APU WITH BLEED ON. NO ODOR NOTED. PERFORMED GENERAL VISUAL INSPECTION FOR OIL LEAK, APU COMPARTMENT. NO SIGN OF OIL LEAK ON THE APU. APU GENERATOR AND OIL PRESSURE SWITCH RECIRCULATION FILTER PREVIOSLY REPLACED. ALL APU INDICATIONS NORMAL AT THIS TIME. NO SIGNS OF LEAK NOR ODOR DETECTED AT THIS TIME THIS CLEARS DMI 5717469 PLACARD, REMOVED MOC NOTIFIED FOLLOWED TESTING TSM 49-00-00-810-169-A.