What was found
FLT NR 4465 - TYS - ON DESCENT THE RIGHT ENGINE OIL PRESSURE LIGHT ILLUMINATED, COCKPIT INDICATOR INDICATED A LOSS OF PRESSURE. THE ENGINE WAS SHUT DOWN BEFORE TOTAL LOSS OF OIL PRESSURE OCCURRED. MAINTENANCE FOUND O-RINGS ON OIL BYPASS VALVE LEAKING. MAINTENANCE REPLACED THE OIL BYPASS VALVE O-RINGS. THE BYPASS VALVE WAS ALSO REPLACED FOR PRECAUTIONARY MEASURES. PERFORMED GROUND RUN NO LEAKS NOTED. (M)