What was found
TYS-EWR - FLT 4148 - AIRCRAFT ORIGINATED TYS EN ROUTE TO EWR, CREW REPORTED NR 2 ENGINE IMPENDING OIL BYPASS, OIL PRESSURE AT 25 PSI, AND DROPPING. CREW SHUTDOWN NR 2 ENGINE. DECLARED AND EMERGENCY AND DIVERTED TO RIC. MAINTENANCE PRESENTLY CHANGING ENGINE. (M)