AAV1000 quit spinning, how do get to the...

AAV1000 quit spinning, how do get to the belt and replace it? A couple of times previously-I would have to re arrange the wet clothes in the tub because it seemed to go off balance at the spin cycle and started banging and walking the floor, sloshing water that leaked out underneath. i would readjust the clothes and the tub and then it worked. this has happened usually on the regular cycle and medium load of clothes. this has started happening over the last few washes. then i noticed the spincycle wasn't spinning, although it does drain the water and ther motor is still working.
We don't have the owners manual, so are having a hard time figuring the best way to get in . we went into the back panel, but can't see where to get at the insides.
Thanks for your help.
Lisa