As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EWR - FLT 3677 - CREW REPORTED, CARGO COMPARTMENT FIRE EXT LIGHT ILLUMINATED ON PREFLIGHT. MAINTENANCE PERFORMED VISUAL INSPECTION AND FUNCTIONAL CHECK OF CARGO COMPARTMENT FIRE EXTINGUISHING SYSTEM, NO DEFECTS NOTED. AIRCRAFT RETURNED TO SERVICE. (M)