What was found
SHIP 9544 - THE FLIGHT CREW RETURNED THE AIRCRAFT BACK TO ATL DUE TO MULTIPLE "FIRE DETECTION FAIL" MESSAGES. AN EMERGENCY WAS DECLARED WITH ATC. NO SECONDARY INDICATION OF A FIRE ON ANY ENGINE GAUGE. CORRECTIVE ACTION: MAINTENANCE FOUND A LOOSE CONNECTOR AT THE FIREWALL. THE CONNECTOR WAS SECURED AND AN OPERATIONAL CHECK WAS GOOD. BOTH VIA AND THE FIRE DETECTION SYSTEM CONTROL UNIT WERE REPLACED AS A PRECAUTION. A SUCCESSFUL VERIFICATION FLIGHT WAS PERFORMED. (LP #9275812)