03 Model 425. 2400 hrs. Fixin to go to motor #3 (or might just get a new PT), numerous cooling fans, all hoses changed couple times, lift arms 3rd set, all cables several times, 3 treadles, and all contraptions that go with it, 2 sets of wheel motors. Actually I believe the only original part is the tub on mine. I have changed just about everything at least once. I will probably buy another one even though Power Tracs are a "love to hate em" kind of machine...at least for us as they are always either broke or working. They never sit idle for us.
That is both impressive and scary. But does sound like you really use. What are you using it for? Do you abuse it?