What was found
APU PRODUCED ODOR IN CABIN, GROUND PERSONNEL REPORTED APU PUTTING OUT SMOKE, SOME OILY SMOKE IN VENT WITH APU BLEED ON ACCOMPLISHED MT 72-016 AND FOUND APU OUT OF OIL, FOUND OIL IN PNEUMATIC DUCT AFT OF LOAD CONTROL VLV. CK MAG PLUG AND EXHAUST AREA NO EXTERNAL LEAKAGE, APU HAS INTERNAL OIL LEAK APU INOP. DUE TO REPORT OF SMOKE COMING FROM THE APU PNEUMATIC SYS, THE APU IS CONSIDERED INOP, AND IS NOT TO BE USED UNTIL THE "SMOKE" PROBLEM IS CORRECTED. DEFER APU INOP. NO OIL IN SITE GAUGE. REPLACED APU.