As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT, THE LEFT ENGINE OIL PRESSURE DECREASED TO 20 PSI AND LOW OIL PRESSURE LIGHT ILLUMINATED. FOLLOWED COCKPIT OPERATING MANUAL PROCEDURES AND PERFORMED A PRECAUTIONARY SHUTDOWN OF LEFT ENGINE. AIRCRAFT CONTINUED TO ORIGINAL DESTINATION AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE LEFT ENGINE OIL PRESSURE REGULATOR VALVE AND OIL FILTER. LEAK AND OPERAITONAL CHECK OK.