I have just done a complete disassembly of mine as one of the drive wheels stopped driving and the robot just went round in circles. You may be able to replace the drive belts by just removing the two small access panels on the bottom which allows the tracks to swivel out of the body. Remove the track covers on the sides of the tracks. It’s then a case of easing the tracks off over the wheels. The larger wheel will “slide” off if you align the notch in the lower edge.
Hope this helps. They are not easy to completely disassemble but for the time being I have restored drive to the track and currently working ok.