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I bought a 2523 Cub Cadet from a friend of mine a week ago. 200 hours and in nice shape. Runs really smooth and has lots of power. Handles the 54” deck with ease. I’m mowing with it and go into reverse to turn around and when I pedal forward something popped and it won’t go forward or reverse. The release at the back will not move the release valve at all and it has no brakes. Linkages are all hooked up so it’s got to be internal. There’s also about 1/4-1/2” play in the rear wheels or axles sliding in and out. I’m a little skidding about tearing into this unit but I really don’t want to have to pay the $75 an hour to the dealer. And I’m not dealing with any shade tree repair shops. Any idea what this might be? And if it us a stuck relief valve how can I diagnose it?