What was found
LEVEL IN CRUISE FLIGHT AT FL240 THEY NOTICED THE OIL PRESSURE WAS IN THE AMBER RANGE. CHECKED OIL QUANTITY AND IT WAS DOWN TO 4 QTS. A MINUTE LATER THEY GOT AN EICAS WARNING E (2) OIL LOW PRESSURE. THE CREW PERFORMED THE CHECKLIST AND WERE DIRECTED TO PERFORM A PRECAUTIONARY ENGINE SHUTDOWN. LANDED WITHOUT INCIDENT. THE AIRCRAFT WAS REMOVED FROM SERVICE. FOUND LEAK COMING FROM NR 4 MAIN GENERATOR. REMOVED AND REPLACED NR 4 MAIN GENERATOR AND CARBON SEAL IAW EMB 145 AMM 24-31-01 AND RR MM 72-63-10. SEAL ASSY, CARBON MAGNET FHA PART NUMBER: 42520-70. PACKING PART NUMBER M83248/1-113. THE OPERATIONAL CHECK, LEAK CHECK AND PRESSURE CHECK WERE GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.