As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STRONG ODOR IN ACFT AFTER TAKEOFF. AFT LAVATORY SMOKE DETECTOR SOUNDED AND F/A REPORTED SMOKE AND HAZE IN THE CABIN. FLIGHT CREW RETURNED ACFT TO DEPARTURE. MX FOUND OIL LEAK FROM APU OIL CAP. REPLACED OIL CAP AND CLEANED RESIDUAL OIL. RAN APU AND NO OIL LEAK NOTED. C/W FULL DUCT BURNOUT. ETOPS CATEGORY 'B': DIVERSION OR TURNBACK.