As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING POST MAINTENANCE RUN, OIL PRESSURE WAS FOUND TO BE READING LOW. MAINTENANCE TESTED THE OIL PRESSURE INDICATION SYS WITH A MASTER GAUGE ATTACHED AND FOUND THAT THE ACFT PRESSURE GAUGE WAS READING ANYWHERE FROM 15 TO 30 PSI LOW. THE GAUGE WAS REPLACED WITH A NEW 1 AND TESTED WITH NO FAULTS FOUND.