As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 222 - DEPARTING DAY, CONDUCTING AN AIR TURN BACK, FOR LOWR AFT BODY OVERHEAT WARNING LIGHT ON. EMERGENCY WAS DECLARED INTO DAY AND AIRCRAFT LANDED SAFELY. REMOVED AND REPLACED FIRE DETECTION ACCY UNIT. RAN ENGINES AT TAKEOFF POWER FOR 5 MINUTES. SYSTEM TEST NORMAL. (M)