What was found
(CAN) ON TAKEOFF ROLL BETWEEN V1 AND V2, ABNORMAL VIBRATION WAS NOTICED. ON CLIMB JUST AFTER GEAR RETRACTION, A-HYD PRESSURE WAS LOST. A/C RETURNED AND LANDED. ONCE STOPPED, THE FOLLOWING CONDITIONS WERE NOTED: NR 1 MAIN WHEEL FUSE PLUG RELEASED DUE TO DISSIPATION OF BRAKE HEAT, NR 2 TIRE TREAD WAS MISSING, AND EVIDENCE OF HYD LEAKAGE IN AND AROUND THE WHEEL WELL AREA. ONCE THE A/C WAS HANGARED AND INSPECTION COMPLETED, FOUND A-SYSTEM HYD LINES SEVERED AND/OR CRACKED. BOTH A-SYSTEM ENGINE DRIVEN PUMPS, ALL MAIN WHEEL ASSEMBLIES, AND BRAKES, AND DAMAGED HYD LINES WERE REPLACED IAW BOEING MM. A/C RETURNED TO SERVICE. PART TC: 29.