What was found
ON TAKEOFF, THE NR 4 RIGHT MAIN TIRE BLEW AND UNABLE TO RETRACT GEAR. RETURNED TO BOM AND LANDED WITHOUT INCIDENT. REPLACED THE NR 3, 4, AND 8 TIRES AND REPLACED THE NR 4 AND 8 BRAKES AND SEVERAL HYDRAULIC LINES AND BRACKETS. ALSO, REPLACED THE RIGHT MAIN GEAR TRIM CYLINDER. LEAK AND OPERATIONAL CHECK GOOD.