I had my 2002 ExM TT in the shop (Weingartz) for an overhaul. When I picked it up they said the pump on the right side was going. They said it is adjusted to be fine in forward, but the right side is slow (I'd say about half the speed) on reverse. They suggested I wait, said it may make it another 2 years. Should I wait or just have it fixed now? How much is it, about, to replace one pump?