As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) IN CRUISE FLIGHT, AT 13,000 FT CREW OBSERVED A RT ENGINE OIL PRESSURE ANNUNCIATOR RED CAPTION ACCOMPANIED BY LOW PRESSURE OF THE RT OIL PRESSURE GAUGE. PRECAUTIONARY RT ENGINE SHUTDOWN PROCEDURES COMPLETED AND IMMEDIATELY LANDED. DEFECT TRACED TO LOOSE "B-NUT" ON RIGID LINE TO PROP PITCH CONTROL UNIT. LINE INSPECTED WITH NO FAULTS. LINE RE-INSTALLED, TORQUED, ENGINE RUN AND LEAK CHECKS PERFORMED, SYSTEM WAS SERVICEABLE.