As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE AFT CARGO FIRE DETECTOR INDICATOR ILLUMINATED WHILE ENROUTE FROM IAH TO RIC. THE SYSTEM WAS TESTED AND TESTED OK, BUT THE LIGHT REMAINED ON. THE AIRCRAFT WAS DIVERTED TO ATL WHERE IT LANDED WITHOUT INCIDENT. THE AFT CARGO BIN WAS INSPECTED WITH NO EVIDENCE OF SMOKE OR FIRE. THE COCKPIT FIRE SUPRESSION SYSTEM PANEL WAS REMOVED AND REPLACED AND OPERATIONAL CHECKS WERE GOOD IAW MM 26-16-10.