As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) LOW OIL PRESSURE WAS REPORTED ON RUN UP. MAINTENANCE TESTED THE OIL PRESSURE GAGE AND SENDER AND FOUND IT TO BE READING MORE THAN 10 PSI LESS THAN THE MASTER GAGE. A NEW OIL PRESSURE KIT WAS INSTALLED, ENGINE RUNS WERE CARRIED OUT WITH NO FURTHER FAULT.