OSC...Close on the belt idea, but actually it is the springs. Supposedly when the hydro is under extreme pressure like on an ncline the naturally tendency is for the fluid to go the path of least resistance which means back to neutral. What they did was put new springs on both sides. Heavier springs. The unit pulls me up hills with power now! Granted...it is a little bit tougher to squeeze the grips, but big forearms help for fall cleanups. The belt had nothing to do with it at least in my case. My first thought was the belt as well as needing additional fluid, but these springs did the trick! My Scag is the 2000 52" with the 17hp Kawi and Advantage deck. <p>As for the switches...I shouldn't have spoken so fast as I went out in the field on Friday after it was supposedly fixed to end up having more problems! When I took off the parking brake the machine would shut down. Needless to say I had 10 to cut and I wasn't taking it back at that point as the dealer was 30 miles away so I called and ended up cutting the wire which overrode the entire safety switch wiring harness. Not a smart thing to do, but I had to get the lawns done. Took the machine back and now it seems to be working. The mechanic that did the work said there was a rubber bootswitch that needed to be popped...gets me...when it comes to electrical systems I'm all thumbs. Excvept for cutting that wire...felt like I was defusing a bomb. Cut the wire and prayed for the best.