What was found
NR 1 ENGINE FIRE DETECTION SYSTEM-A UNABLE TO TEST. NR 1 ENGINE OVERHEAT AND FIRE DETECTION SYSTEM-A DEFERRED PER MEL 26-6 CAT-C. DMI 12653 PLACARD INSTALLED. REF DMI 12653 1 ENGINE FIRE DETECTION SYSTEM-A UNABLE TO TEST. REMOVED AND REPLACED FIRE DETECTION POWER UNIT SYSTEM, OPS CHECKED BAD PER GMM 26-11-1. DMI 12653 REMAINS OPEN. REINSTALLED ORIGINAL POWER UNIT. REF DMI 12653 NR 1 ENGINE FIRE DETECTION SYSTEM-A UNABLE TO TEST. REMOVED AND REPLACED NR 1 ENGINE FIRE WALL SENSOR RESPONDER WITH SERVICEABLE UNIT. OPS CHECKED GOOD IAW M/M 26-11-31. THIS CLEARS DMI 12653.