As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU CAUSED SMOKE IN THE CABIN AFTER LANDING IN LGA WITH LAV SMOKE DETECTOR GOING OFF. FOUND APU LEAKING OIL INTO INLET. PERFORMED PNEUMATIC SYSTEM DUCT BURN OUT OPN 5089. ALL NORMAL NO SMOKE OR ODOR IN CABIN, ALSO DEF APU PER MEL 49-00-01A.