As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED LEFT ENGINE OIL PRESSURE RED WARNING AND THAT OIL PRESSURE WENT TO ZERO PSI IN FLIGHT EN ROUTE FROM PHL TO BNA. CREW PERFORMED IN-FLIGHT SHUTDOWN OF LEFT ENGINE AND DIVERTED TO GSO. AIRCRAFT LANDED IN GSO WITHOUT FURTHER INCIDENT. MAINTENANCE INSPECTED, REMOVED AND REPLACED LEFT ENGINE AND PERFORMED CHECKS USING AIRCRAFT MAINTENANCE MANUALS. AIRCRAFT RELEASED FOR SERVICE.