As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT, AIRCREW NOTICED LOW OIL PRESSURE TO THE MAIN GEAR BOX, NO LIGHT OR OTHER INDICATIONS NOTED. AIRCRAFT RETURNED TO BASE WITH NO OTHER DISCREPANCIES. PERFORMED INSPECTION OF THE MAIN GEAR BOX SUMP SCREEN AND FOUND THE SCREEN COVERED WITH THE INTERNAL RESIN COATING OF THE GEAR BOX. AIRCRAFT WAS REMOVED FROM SERVICE AND THE MAIN GEAR BOX WAS REPLACED WITH SERVICEABLE UNIT.