What was found
RT ENGINE FIRE WARNING ACTIVATED 5 MINUTES AFTER T/O FROM SEA. RT ENGINE SHUT DOWN. PILOTS REQUESTED RETURN TO SEA. AN EMERGENCY WAS DECLARED AND THE FLIGHT RETURNED TO SEA WITHOUT INCIDENT. INSPECTION OF THE AIRCRAFT NO EVIDENCE OF A FIRE. MAINTENANCE TESTED EACH FIREWIRE AND COUPLING ON RT ENGINE. REPLACED ALL DEFECTIVE FIREWIRES AND COUPLINGS. REMOVED AND REPLACED RT ENGINE FIRE BOTTLES AND CARTRIDGES. A/C RETURNED TO SERVICE. (M)