What was found
NORMAL FLIGHT UNTIL CLIMBING THROUGH FL300, NOTICED OIL PRESSURE FOR NR 2 ENGINE WAS IN THE AMBER RANGE ON THE EICAS. CHECKED QUANTITY OF OIL ON NR 2 ENGINE, NOTICED ONLY 3 QUARTS (8 QUARTS OBSERVED DURING AFTER START CHECK). PRESSURE FELL TO 19 PSI IN THE RED RANGE & MASTER CAUTION BELL WENT OFF ALONG WITH ASSOCIATED EICAS WARNING FOR LOW OIL PRESSURE. RAN QRH, ADVISED TO DO A PRECUATIONARY ENGINE SHUTDOWN. TOTAL TIME FROM NOTICING OIL PRESSURE & TIME ENGINE SHUTDOWN APPROX 3 MINS. NO OTHER ENGINE LIMITS EXCEEDED. ATC CLEARED DIRECT TO CMH. REST OF FLIGHT WAS UNEVENTFUL, LANDED OVERWEIGHT. REMOVED & REPLACED MAGNETIC CARBON SEAL FOR NR 2 GENERATOR & NR 2 FPMU. RAN ENG, CHECKED FOR LEAKS, NONE FOUND.