As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ACFT WAS SNAGGED FOR LOW OIL PRESSURE. MAINTENANCE FOUND THAT THE OIL PRESSURE GAUGE WAS READING 10 PSI LOWER THAN THE CALIBRATED TEST GAUGE. A NEW OIL PRESSURE KIT WAS INSTALLED AND IT ALSO FAILED THE CALIBRATION CHECK. A SECOND KIT WAS INSTALLED AND CHECKED WITH NO FURTHER ISSUES.