What was found
TWENTY MINUTES AFTER DEPARTURE, AIRCRAFT EXPERIENCED SMOKE IN COCKPIT AND CABIN. RT AIR CONDITIONING PACK WAS SHUT DOWN AND SMOKE SUBSIDED. AIRCRAFT RETURNED TO EWR. *S/D* APU (P/N 3800550-1), (S/N P1054), THE LOAD COMPRESSOR DISASSEMBLY YIELDED THE FOLLOWING RESULTS: BEARING HOUSING HAD EVIDENCE OF OIL STREAKING FROM THE PARTING SURFACE TO THE AIR INLET. BEARING HOUSING O-RING (M8324-1-158) WAS ROLLED AND HAD A SECTION CUT (SLICED) FROM THE OD APPROX .25 INCH LONG. BEARING CARRIER O-RING (M8324-1-145) CUT (SLICED) IN 3 DIFFERENT SECTIONS FOR A TOTAL OF 3 INCHES OF O-RING MATERIAL REMOVED.