As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) WHILE TROUBLESHOOTING AN OIL PRESSURE SNAG THE MECHANIC TESTED THE OIL PRESSURE GAGE AND SENDER FOR ACCURACY WITH A CALIBRATED SHOP GAGE. THE ACFT INDICATOR WAS FOUND TO BE UNDER READING BY 15 PSI OR MORE AT VARIOUS STAGES OF INDICATION. A NEW SENDER AND GAGE WAS INSTALLED AND TESTED WITH NO FAULTS FOUND.