As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) THE ACFT WAS SNAGGED DURING THE RUNUP FOR LOW OIL PRESSURE, NOT IN THE GREEN AT 2000 RPM. MAINTENANCE TESTED THE GAUGE AND SENDER WITH A CALIBRATED GAUGE AND FOUND IT TO BE READING 15 PSI LOWER THAN THE MASTER GAUGE. A NEW OIL PRESSURE KIT WAS INSTALLED AND TESTED NORMAL. THIS IS THE SIXTH FAILURE OF A GAUGE IN THIS ACFT ALONE AND OVER 60 OF THE NEW GAUGE KITS HAVE BEEN REPLACED ON OUR FLEET FOR READING LOW.