As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE AIRCRAFT WAS GROUNDED. AFT CARGO FIRE INDICATION N CRUISE. FOLLOWED ECL PROCEDURE. INDICATION WENT OUT. AN EMERGENCY WAS DECLARED AND THE FLIGHT DIVERTED TO KEF WITHOUT FURTHER INCIDENT. MAINTENANCE ACCOMPLISHED VISUAL INSPECTION OF THE AFT CARGO COMPARTMENT. NO DAMAGE FOUND, NO INDICATION OF HEAT DAMAGE OR FIRE PER AMM 25-52-00.