As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
"SUP" LAVATORY SMOKE DETECTOR GOING OFF ON TAKEOFF, VISIBLE SMOKE IN CABIN - RETURNED TO DFW. REMOVED AND REPLACED NUMBER 2 ENGINE IAW AMERICAN EAGLE WORK CARD 72-000-00. ALL OPERATIONAL AND LEAK CHECKS COMPLIED WITH NO DEFECTS NOTED, RETURNED AIRCRAFT TO SERVICE.