I received got a tb135 with hydraulic thumb. The thumb goes out without a problem but doesn't go back in with any regularity. Sometimes it does but 90% of the time it doesn't. I originally got it working by tapping on the joystick. Seems like when it does work it works until you shut the machine off. I'm thinking obviously it's in the joystick but haven't dove into taking it apart. Switch in the joystick bad? Yes. I already checked the one way valve.