My Ultra Vac recently stopped moving - my suction is good and all of the consumables have been replaced. When it's on the bottom of the pool, the pods stop moving because it's being pulled on to the pool bottom and the force of the pods isn't enough to get it to move. I assume that this means that the internal gearing is bad, so I would like to replace all of the suspect parts.

Is there a list of parts that I should replace to give it a full "tune-up"?