What was found
CLIMBING THROUGH 10,000 FT. NR 2 ENGINE OIL TEMP WAS 108 C. AFTER E/A CHECKLIST, OPERATING NR 2 AT 20 C LESS TORQUE, OIL TEMP COOLED SLOWLY TO 100 AFTER 10 MINUTES. MATCHED NR 1 OIL TEMP AFTER 13 MINUTES. THEN STAYED AT 5 PERCENT LESS THAN NR 1 TEMP FOR REMAINDER OF FLIGHT. SHOWED 5P MORE FOR TAXI IN. HIGHEST TEMP OBSERVED WAS 109 C FOR NO MORE THAN 1 MINUTE. TEMP ABOVE 107 FOR LESS THAN 10 MINUTES. REMOVED FROM SERVICE. FOUND NR 2 OIL COOLER FLAP DOOR FAILED OPS CHECK IAW AMM TASK 79-21-31-710-801. R&R NR 2 OIL COOLER AIR OUTLET FLAP ACTUATOR IAW Q400 AMM TASK 79-21-31-000-801 AND 79-21-31-400-801. OPS TEST GOOD. RETURNED TO SERVICE.