As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A LOWER CARGO FIRE WARNING ILLUMINATED IN FLIGHT. MAINTENANCE RESET THE FIRE WARNING CIRCUIT BREAKER AND COMPLETED ADJUSTMENT TEST AND OPERATIONAL TEST IAW DC-9 MM 26-15-00-5-0001. INSPECTED THE AFT CARGO PIT FOR EVIDENCE OF SMOKE. NO DEFECTS WERE NOTED.