What was found
(CAN) WHILE INVESTIGATING A GRADUAL PRESSURE LOSS OF ONE THE 4 MAIN WHEELS, THE BALANCE, THE WEIGHT THAT IS ADHERED TO THE INSIDE OF THE TIRE BY THE MFG WAS FOUND TO HAVE DE-BONDED FROM THE INSIDE OF THE TIRE AND WAS LOOSE INSIDE OF THE TIRE. THE BALANCE WEIGHT SHOWED SIGNS OF DISINTEGRAT1NG AND SMALL BITS OF RUBBER WERE FOUND TO BE INSIDE OF THE TIRE. THE MAINTENANCE ENGINEER SPECULATES THAT SOME OF THESE SMALL BITS OF RUBBER MAY HAVE GOTTEN IN BETWEEN THE BEAD AND THE TIRE RESULTING IN THE SLOW LOSS OF PRESSURE FROM THAT TIRE. THERE WAS NO DAMAGE TO THE WHEEL ASSY AND THE TIRE WAS REPLACED WITH A NEW ONE. ACFT WAS RETURNED TO SERVICE.