As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER STARTING BOTH ENGINES, THE FIRE INDICATION FOR THE RT ENGINE WENT OFF. MAINTENANCE INSPECTED ALL FIRE DETECTORS AND TESTED THEM AND FOUND THEM TO BE SERVICEABLE. AN ENGINE RUN WAS ALSO CARRIED OUT AND WAS SUCCESSFUL. THE AIRCRAFT WAS RETURNED TO SERVICE. MOISTURE IS SUSPECTED AS THE CAUSE.