As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER START UP LT ENGINE LOW OIL PRESSURE "RED" INDICATION AND AURAL WARNING ACTIVATED AND WOULD NOT CANCEL. OIL PRESSURE DIGITAL TAPE READOUT WAS NORMAL. 75 PERCENT GROUND RUNS CARRIED OUT, TAPE INDICATION FOLLOWED THROTTLE AS NORMAL BUT LIGHT/WARNING WOULD NOT CLEAR. PRESSURE SWITCH`S SWAPPED LT TO RT FOR TROUBLESHOOTING, SNAG FOLLOWED PART. NEW PRESSURE SWITCH PROCURED AND INSTALLED, OPS CHECKED OK. ALL OTHER SYSTEMS NORMAL.