As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE FLIGHT THE TRANSMISSION OIL PRESSURE GAUGE WENT TO ZERO. TRANSMISSION OIL TEMPERATURE REMAINED WITHIN THE NORMAL RANGE AND NO WARNING LIGHTS CAME ON. A PRECAUTIONARY LANDING WAS PERFORMED. DISCONNECTED AND CLEANED CONNECTORS AT INSTRUMENT AND TRANSMITTER. REMOVED AND REPLACED TRANSMISSION OIL TRANSMITTER