As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED LOSS OF OIL PRESSURE (DROPPED IN YELLOW BAND) AND LOSS OF POWER (LEFT). DIVERTED TO EUGENE. ADJUSTED OIL PRESSURE REGULATOR PER MM 72-1-50. OPS AND LEAK CHECKS GOOD. REPLACED LEAKING FUEL OIL HEATER PER MM 72-01-40. OPS AND LEAK CHECKS ON GROUND. PERFORMED HIGH POWER RUNS FOR 10 MINUTES. NO SYSTEM DEFECTS NOTED.