As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT CREW REPORTED SMOKE AND FUMES IN THE CABIN, COCKPIT AND ALL LAVATORY ALARMS SOUNDING DURING TAKEOFF. FLIGHT CREW RETURNED ACFT TO DEPARTURE AIRPORT. MX FOUND APU COMPARTMENT CONTAMINATED WITH OIL AND APU OIL CAP SEAL "TORN". MX REPLACED THE OIL CAP AND SEAL, CLEANED THE APU COMPARTMENT AND PERFORMED PNEUMATIC DUCT BURNOUT.