What was found
HAZE AND SMOKE OBSERVED IN CABIN 5 MINUTES AFTER STARTING APU. GROUND PERSONAL OBSERVED SMOKE COMING FROM APU EXHAUST AND LOUD POPPING NOISES. PACKS AND APU WERE IMMEDIATELY SHUTDOWN. T/S SMOKE IN THE CABIN PER AMDS WORKCARD 2120-2367, FIGURE 6. FOUND EVIDENCE OF OIL IN LOAD CONTROL VALVE ELBOW BUT NONE IN CROSS OVER DUCT AND CHECK VALVE. PERFORMED DUCT CLEANING WITH REF TO AMDS CARD 2120-2368, AND PERFORMED PNEUMATIC SYS ODI PREVENTION PROGRAM. APU COMPARTMENT DRY- NO EXTERNAL OIL EVIDENCE PRESENT. INTERNAL. WILL REQUIRE APU CHANGE (LP6921374)