What was found
CREW REPORTED, MASTER WARNING AND LAVATORY SMOKE INDICATION ON EICAS. AIR RETURNED TO EWR, LANDED UNEVENTFULLY. MAINTENANCE REMOVED AND REPLACED SMOKE DETECTOR SENSOR (PART NUMBER: FDS765A-2 SERIAL NUMBER: 203574) IAW EMB145 AMM 26-14-01. REMOVED AND REPLACED SMOKE DETECTOR PANEL FORWARD GALLEY (PART NUMBER: FAU751A-4 SERIAL NUMBER: 042797) IAW EMB145 AMM 26-14-02, RAN BOTH ENGINES TO TAKEOFF POWER FOR FIVE MINUTES OPS CHECKED GOOD, LAVATORY SMOKE DETECTION SYSTEM OPS CHECKED GOOD IAW EMB145 AMM 26-14-00. AIRCRAFT RETURNED TO SERVICE.