As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAVATORY SMOKE WARNING MESSAGE ON TAKEOFF WHEN PACKS SELECTED ON, EMERGENCY DECLARED. RETURNED TO ORD. REMOVED AND REPLACED NR 2 ENGINE IAW AMERICAN EAGLE WORK CARD 72-000-00. OPERATIONAL AND LEAK CHECK GOOD. RETURNED AIRCRAFT TO SERVICE.