What was found
NR 2 ENGINE PRECAUTIONARY SHUT DOWN IN CRUISE DUE TO HIGH OIL TEMP (105 DEGREES), LOW OIL PRESS (55 PSI), UNABLE TO CONTROL RPM (STUCK AT 2400), OIL COOLER CONTROL HAS NO EFFECT. REPLACED NR 2 OIL COOLER ACTUATOR, PERFORMED GROUND MAINT RUN, OIL PRESS AND OIL TEMP WITHIN LIMITS, BMEP, F/F, MAG CHECK OK. PROP OPERATION AND FEATHER CHECK NORMAL. REF NAC DC-6 MM SECT IV EC01.1 AND 2 AND PURDUE MM 11-1-6.