As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PIT - FLT 2147 - AFTER TAKEOFF FROM PIT, FLIGHT ATTENDANT INFORMED CAPTAIN THAT THERE WAS SMOKE IN THE AFT CABIN WITH THE AFT RIGHT LAVATORY SMOKE DETECTOR SOUNDING OFF. CAPTAIN DECLARED AN EMERGENCY. FLIGHT RETURNED TO FIELD AT PIT AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND THE AFT RIGHT LAVATORY SMOKE DETECTOR FAULTY. REMOVED AND REPLACED THE SMOKE DETECTOR. PERFORMED HIGH POWER ENGINE RUNS. OPERATED ALL A/C SYSTEMS. NO DEFECTS NOTED. (M)