As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 4159 - AFTER TAKEOFF FROM ATL, BOTH PILOTS SMELLED A BURNING ODOR FOLLOWED BY THE LAVATORY SMOKE DETECTOR SOUNDING. RIGHT PACK FAIL MESSAGE ILLUMINATED. AIRCRAFT RETURNED AND LANDED SAFELY IN ATL. MAINTENANCE FOUND RIGHT RAM AIR DOOR STUCK. MAINTENANCE LUBRICATED RAM AIR DOOR. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE. (M)