What was found
AFTER PUSHBACK R HYD SYS PRESS EICAS MESSAGE AND DISCRETE LIGHT ILLUMINATED AFTER SETTING BRAKES AFTER PUSH-BACK. R HYD STS QUANTITY ON STATUS PAGE READS 0.00RF.AC RETURNED TO GATE AND SHUT DOWN ,MAINTENANCE GROUNDED AC .AND FOUND NBR ONE MLG BRAKE HYDRAULIC FUSE HOUSING CRACKED. REPLACED FUSE IAW B767 AMM 32-42-03. SERVICED HYDRAULICS ,OPS AND LEAK CHECKS GOOD. A/C REMAINS CAT 3A OPERATIONAL. AC WAS RETURNED TO SERVICE .