What was found
FLIGHT 3223 PHL-ABE - AFTER DEPARTURE AT APPROXIMATELY 500 FT MSL RECEIVED AN EICAS MESSAGE LAV SMOKE. THE FLIGHT ATTENDANT INVESTIGATED THE LAVATORY AND INFORMED THAT ALL WAS NORMAL IN THE LAVATORY WITH NO INDICATIONS OF FIRE OR SMOKE AT ALL. PHL OPERATIONS WAS NOTIFIED AND THE AIRCRAFT RETURNED TO THE FIELD NON-EMERGENCY LANDING. THE AIRCRAFT WAS VECTORED FOR A VISUAL APPROACH TO RUNWAY 27R AND LANDED UNEVENTFULLY. THE AIRCRAFT WAS FERRIED TO IND WHERE MAINTENANCE REMOVED AND REPLACED THE LAVATORY SMOKE DETECTOR. ENGINE RUNS WERE PERFORMED WITH NO DEFECTS NOTED IAW EMB 145 AMM 26-14-01.