While I was doing regular maintenance on our three exmark hp 52's, I noticed that they are leaking from the top of the pumps located under the seat. Can you please tell me if there are any service bulletins. Two of the three are still under warranty. Also while I have your attention, why do the gas shocks that control the steering go out about twice a year? The dealer says this is not a warranty item. This is getting expensive at 27.50 a shock. We are putting about 600-700 hours on each machine per season. Models were new in 2000, 2001, 2002.