As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAV SMOKE TRIPLE CHIME AND EICAS MESSAGE WHILE CLIMBING THROUGH 7,800 FEET. REFERENCED QRH AND PULLED CB E11 AND E12, MESSAGE WENT AWAY BEFORE PULLING THE CIRCUIT BREAKERS. FLIGHT ATTENDANT REPORTED NO SIGNS OF SMOKE OR FIRE. MAINTENANCE REMOVED AND REPLACED THE LAVATORY SMOKE DETECTOR. PERFORMED LAV SMOKE DETECTION SYSTEM TEST. OPS CHECK GOOD IAW EMB 140 AMM 26-14-00.