What was found
AFTER RUNNING APU FOR APPORX 5 MINUTES A WAVERING SQUEAL WAS HEARD AND SMOKE FILLED THE COCKPIT. APU WAS THEN IMMEDIATELY SHUTDOWN. NO SMOKE VISIBLE OUTSIDE. OIL FOUND DRIPPING FROM BOTTOM OF ACM. T/S AND FOUND APU HAD OIL IN INLET CAUSING SMOKE IN COCKPIT PLACED APU ON MEL AND RAN ENGINES FOR 15 MINUTES TO 30 MINUTES AFTER CLEANING SOCK AND NO ODOR OR SMOKE NOTED AND NO OIL DRIPPING FROM ACM IAW MM 12-19-08.