I got the new one from Mercedes I believe. But I am not sure. I have had it for a long time.
The valve is actually pretty simple. Often the inside is just frozen because of dirt after sitting. It works electromagnetic so valve and coil are isolated.
I have taken an old one apart and just cleaned it and it worked fine afterwards. I have also had one where the electric part was dead. That might be repairable.
Take care when taking it apart.
Jens
1963 600 SWB W100 #099 (Project)
1965 600 SWB W100 #141
1967 600 SWB W100 #867
1962 Jaguar MK2 3.8 stick with overdrive
Sold -1971 C3 Corvette 454