As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ACV - RIGHT ENGINE FIRE DETECTION LIGHT ILLUMINATED IN FLIGHT. MAINTENANCE INSPECTED ENGINE. DETERMINED FIRE INDICATION TO BE FALSE INDICATION. REPLACED FIRE DETECTOR CONTROL UNIT. ENGINE FIRE DETECTION SYSTEM OPERATIONAL TEST NORMAL. AIRCRAFT RETURNED TO SERVICE. (W)