As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 3333 - IN CRUISE FLT, THE RIGHT PROP OIL TEMPERATURE BEGAN TO RISE TO FLUCTUATE AND INCREASE TO 140 DEGREES. THE CREW COMPLIED WITH QUICK REFERENCE PROCEDURES AND RETURNED TO DTW. MAINTENANCE REPLACED RIGHT OIL PRESSURE/TEMPERATURE REGULATING VALVE ON HEAT EXCHANGER. ALL CHECKS GOOD. (M)