As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT PROP OIL GAUGE FLUCTUATION HEAVILY THEN TO FULL SCALE DEFLECTION VARIOUS POWER SETTINGS. SYSTEM HAS BEEN CHECKED FOR LEAKAGE AND BLOCKAGE NO LEAK HAS BEEN FOUND. PROP OIL TEMP GAUGES SWAPPED LH WITH RH ENGINE AND CLEANED CONNECTOR AT PGB OIL PRESS/TEMP SENSOR AS PER AMM79-30-15-02 & AMM79-30-10-02. ENGINE RUN-UP TEST SATISFACTORY CONDITION.