What was found
(CAN) ON TAKEOFF, THE CREW NOTICED A VIBRATION AS THE GEAR CAME UP. IT WAS SUSPECTED THAT THE NR 4 TIRE HAD FAILED. THE AIRCRAFT RETURNED FOR A LANDING AT THE POINT OF DEPARTURE. SOME DAMAGE FROM TIRE MATERIAL WAS FOUND ON THE RT MLG AFT DOOR AND RT MLG FWD FAIRINGS. NR 3 AND NR 4 MAIN WHEELS WERE REPLACED, DAMAGED ADDRESSED AND THE AIRCRAFT WAS SUBSEQUENTLY RELEASED FOR SERVICE.