What was found
ON LANDING ROLLOUT WHILE COMING OUT OF REVERSE THRUST, THE NR 3 ENGINE EGT STARTED RISING RAPIDLY. THE ENGINE WAS SHUT DOWN WITH A MAX EGT OF 650C. MAINTENANCE CHECKED REVERSER OPERATION PER MM 78-30-00, WITH NO DEFECTS NOTED. EGT WAS WITHIN LIMITS PER MM 72-00-00, PG 227. AIRCRAFT WAS RETURNED TO SERVICE. EXACT PART CAUSING PROBLEM TO BE DETERMINED.