Have you tried running the machine for evidence of problems?
Try moving the belt by hand to check if the mechanism is seized. It should move reasonably easy if the drive mechanism is in neutral or agitate mode, more difficult if spin is engaged.
Set the timer to the final spin position (the hash mark before Off) on any cycle to check if spin works.
It won't normally agitate without water filled to the set level, but there may be a dry agitate position somewhere on the timer. I don't know where that position may be, perhaps someone else can advise you.
Possible water leaks can't be identified, of course, unless it's run with water.