What was found
(CAN) UPON INSTALLATION OF OVERHAULED ENGINE, DURING INITIAL GROUND RUN, AME NOTICED EXCESSIVE OIL LEAK FROM OIL COOLER BLOWER PAD (FRONT SPARE ACCESSORY DRIVE PAD). ENGINE WAS SHUT DOWN.UPON INSPECTION, WHEN OIL COOLER BLOWER WAS REMOVED, IT WAS FOUND THAT THE RESERVOIR WASFULL OF OIL AND THE SEAL HAD APPROXIMATELY .333 OF ITS LIP EITHER CRACKED OR MISSING (SEE ATTACHED PHOTO). IT WAS NOTED THAT THE SEAL HAD BEEN MODIFIED TO P/N 23063371 IAW CEB 72-3260, BY REMOVINGTHE SEAL SPRING.IT WAS ALSO DETERMINED THAT THE ENGINE HAD UNDERGONE A FULL TEST BUT THE SEAL FAILURE HAD NOT BEEN DISCOVERED BECAUSE THE SPARE ACCESSORY PAD WAS BLANKED OFF AND SEALED.