Seveal questions. I have two lesco Vipers. Both a little less than ten years old. It appears the engines need replacement (on both). One otherwise is in good shape, no leaks functions properly. Other has two small leaks at wheel motors (each one, seal on axle shaft). Is it worth repowering these units? I'm guessing it will cost me around $ 1500.00/each. Lesco parts are not the easiest to come by, & I have started switching to JD. What are these units worth if I sell them?(probably not much) Running (new engines) or for parts? Thanks.