It's not the valvebody, it's just the solenoids. They used a plastic liner inside the bushings that guide the pin. The plastic (PTFE teflon) swells just enough to bind the pins. I have a jig to open the top of the solenoid can, remove the guts, run a reamer through the bushings, and crimp them back together.
Audi to VW, Jaguar/Rover, Chevy/Ford, even BMW/Mini.... everyone used the unit except Toyota and Chrysler/Mercedes. Toyota knew what they were doing when they sold it to everyone else, all right. Now that I have the tooling and my competition is swapping complete valvebodies, it's a very lucrative job.