What was found
CLIMBING THROUGH 11 - 12,000FT, THE NR 2 ENGINE OIL TEMP WENT TO 158 DEGREES, REDUCED POWER, RAN CHECKLIST WHILE BRING POWER BACK UP TEMP FLUCTUATED A FEW TIMES THEN RETURN TO NORMAL WITH LIMITS FOR CRUISE POWER. REMOVED AND REPLACED THE NR 2 AIR OIL COOLER IAW MM 79-25-10, LEAK AND OPS CHECKED GOOD IAW MM 72-00-00. BOTH ENGS. 90 DEGREE C AFTER THREE MINUTES.