As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MFR FLIGHT: NR 1 OIL TEMP, 119 DEGREES IN CRUISE AT FL250. BYPASS DOOR CLOSED IAW EMERGENCY CHECK LIST. NO CHANGE. INFO CRUISE TQ 65 PERCENT OAT - 27. NR 1 OIL PRESSURE 69. MAINTENANCE PERFORMED SPECIAL INSPECTION FOR ELEVATED OIL TEMP PER Q400 MM 05-53-00-210-814 FOR LEVEL B OIL TEMP AND REPLACED OIL COOLER BYPASS VALVE PER Q400 MM 79-21-06-400-801. ALL POST MTX TESTS CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.