As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKE OFF BOTH LAVATORY SMOKE DETECTORS ACTIVATED. WITH WHITE SMOKE IN AFT CABIN. CORRECTIVE ACTION: FOUND APU TO BE PRODUCING OIL INTO PACK SYSTEMS FROM INTERNAL LEAK. REMOVED AND REPLACED APU ASSY PER AMM 49-10, FUNCTIONAL CHECK NORMAL.