What was found
(CAN) PILOT REPORTED DEFECT, OIL STREAK FOUND DOWN SIDE OF COWL ON PILOT`S SIDE. OIL LEVEL FOUND TO BE DOWN 1 QT FROM BEGINNING OF THE FLIGHT. SUSPECT OIL LEAK. REMOVED COWLS AND INSPECTED FOR OIL LEAKS. FOUND NR 6 CYLINDER ROCKER BOX COVER LEAKING. REMOVED NR 6 CYLINDER ROCKER BOX COVER AND REPLACED GASKET WITH NEW, PN 655528 GASKET. INSTALLED ROCKER BOX COVER AND TORQUED TO 60" POUNDS IAW CONTINENTAL SB96-7D TORQUE LIMITS. INSTALLED COWLS, CARRIED OUT RUN UP AND LEAK CHECK, NO DEFECTS FOUND.