What was found
(CAN) TAKEOFF REJECTED DUE TO LOW OIL PRESSURE WARNING LIGHT ON NR 2 ENGINE. AIRCRAFT RETURNED TO GATE AND OIL WAS ADDED TO NR 2 ENGINE. MAINTENANCE TROUBLESHOT ENGINE AND THE FOLLOWING WAS ACCOMPLISHED: P2.5/P3 SWITCHING VALVE CLEANED, CENTRIFUGAL BREATHER OIL SEAL REPLACED, OIL PRESSURE CHECK VALVE ASSEMBLY, AND OIL PRESSURE REGULATING VALVE REPLACED, AND OIL PRESSURE SWITCH REPLACED. SYSTEM CHECKED SERVICEABLE AND THE AIRCRAFT RETURNED TO SERVICE.