As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CARGO SMOKE LIGHT ILLUMINATED IN FLIGHT, THE NR 1 CARGO EXTINGUISHER FIRE BOTTLE WAS FIRED. NO SMOKE OR FIRE WAS EVIDENT TO THE FLIGHT CREW. MAINTENANCE REPLACED THE CARGO FIRE BOTTLE AND CLEANED BOTH CARGO SMOKE DETECTORS. THE AIRCRAFT WAS RELEASED FOR SERVICE.