As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RDU - FLT 1880 - EN ROUTE MIA/DTW DURING CRUISE, LOWER AFT BODY OVERHEAT LIGHT BEGAN TO FLICKER. SHORTLY AFTER BEGINNING QRH PROCEDURE, LIGHTS STOPPED FLICKERING AND SYSTEM WOULD NOT TEST. AIRCRAFT DIVERTED TO RDU AND LANDED WITHOUT INCIDENT. REPLACED FIRE DETECTION ACCESSORY CONTROL UNIT. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)