Can you let me know where the tutorials are at. I've tried a number of searches and find nothing. Thank You in advance, Len.........
Unfortunately, with the UK Airgunforum going belly up, I can not find the pictures that I referenced earlier for a tutorial.
The last that I knew, Joe Hein at Elite Shooting Sports had a stash of obsolete Anschutz parts, although I am unsure if he is able or willing to perform a service on one.
I can give you a general idea of what you have to do to get to the valve though.
With the rifle removed from the stock, look directly below the sliding breech block and you will see two allen screws that secure the trigger block to the barrel block.
Those two screws must be removed to access the 4 screws captivated by the trigger block. Those 4 screws are what secures the valve assembly to the pump housing and contain the firing valve.
The firing valve is contained in a silver housing that is visible directly below the breech end of the barrel and is where the nose of the sliding breech block seals when the rifle is in battery. The silver ramped part with the hole in its top is the valve housing.
The tricky part is the partial disassembly of the trigger housing to disconnect the cocking linkage that is tied to the pump arm assembly.
There is a plate on the right side of the trigger assembly secured by two Phillips or cross point screws that must be removed to disconnect the linkage arm. There is a 3 inch long or so tension spring that must be unhooked as well
I suggest taking copious pictures and proceeding carefully with this step. I do not recall any springs or parts flying out unexpectedly, but there are several small fiddly bits that must be in the correct orientation upon re assembly.
Hopefully this is of some help