As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLE - FLT 3829 - AFTER TAKEOFF ON INITIAL CLIMB, THE CREW REPORTED A LAVATORY SMOKE ALARM ILLUMINATED ON THE EICAS. THE BLEEDS AND PACKS WERE SELECTED ON. THERE WAS A SLIGHT HAZE IN THE CABIN. THE AIRCRAFT RETURNED TO CLEVELAND WITHOUT FURTHER INCIDENT. MAINTENANCE REMOVED AND REPLACED THE APU THAT WAS ON MEL IAW 49-10-01 AND 36-00-00. THE AIRCRAFT WAS RELEASED FOR SERVICE. (M)