As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 9500 - COS-DIV - EN ROUTE NOTICED LEFT OIL PRESSURE IN AMBER RANGE, SYSTEM PAGE INDICATED 66 PSI. FOLLOWED CHECKLIST AND FEATHERED PROP, PRESSURE REMAINED AT 66 PSI AND PROP OIL PRESSURE CAS MESSAGE ILLUMINATED, FOLLOWED CHECKLIST AND SECURED ENGINE. REMOVED AND REPLACED OIL PRESSURE SWITCH, OPS AND LEAK CHECK GOOD IAW JIC. (M)