As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 902 - PIT-BWI - AFTER TAKEOFF THE FLIGHT ATTENDANT REPORTED THAT THE AFT LAV SMOKE DETECTOR WAS SOUNDING AND THER WAS ALSO A 'SCORCHED' SMELL IN THE AREA. RETURNED TO FIELD. RAN APU AND ENGINE PNEUMATICS, PRESSURIZED A/C. NO UNUSUAL SMELLS NOTED. REPLACED AFT LAV SMOKE DETECTOR. (M)