As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RT PROP OIL TEMP GAUGE INDICATING IN THE RED ZONE AND SOMETIMES OVER RED LINE PROP OIL PRESSURE INDICATING NORMAL. MAINTENANCE REPLACED RT PGB OIL COOLER PRESS/TEMP CONTROL REGULATING VALVE AT COOLER, AND REPLACED RT PROP OIL PSI GAUGE. REFERENCE MM 409 CARD 05351 DBL 1-5 FOR DETAILS. OPS CHECKS GOOD ON GROUND RUN.