What was found
(CAN) ON JAN 02/2001 CREW OF A/C C-GTAF, S/N 087 ABORTED ITS TAKEOFF OUT OF GRAND PRAIRE (YQU) DUE TO ILLUMINATED OF NR 2 OIL PRESSURE LIGHT DURING TAKEOFF ROLL. A/C RETURNED TO GATE WITH NO FURTHER INCID. TO RPT. CRA CONTRA CTED ENGINEER FROM SWAN AERO 2000 TO INSPECT A/C. INIT INSP REVEALED LOW OIL QUANTITY. OIL LEVEL TOPPED UP & GROUND RUNS WERE COMPLETED. POST RUN UP INSP FOUND LEAK AT INBOARD OIL COOLER CONNECTION. CARA ENG INEER SENT TO YQU WITH PARTS & FURTHER INSP. MAINT FOUND CAUSE OF LEAK TO BE O-RING IN OIL COOLER BYPASS VALVE. PARTS WERE REPL&A/C GROUND CHECKED FOR LEAKS.A/C RT-SRV WITH NO FURTHER I NCIDENTS TO RPT.