As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT ATTENDANTS SMELLED AN ELECTRICAL BURNING ODOR, A LITE HAZE ALSO APPEARED. AFT LAV SMOKE DETECTORS WERE INTERMITTENTLY SOUNDING FOR APPROX 2 MINUTES THEN WENT OFF COMPLETELY. PERFORMED OPN 5088. NO ELECTRICAL SMELL NOTED. REPLACED APU DUE TO OIL LEAK REF ITEM 3. PERFORMED DUCT BURNOUT. REPLACED WATER SEPARATOR BAGS. RAN ENGS TO TAKEOFF POWER. NO SMELL OR HAZE NOTED.