Hi Alyosha --
There were a group of Forum Posts dealing with replacing the PAS Selector Switch, complete with some wiring diagrams. Here are the Titles and the names of the author and the dates. There maybe more?!
#1 -- PAS Selector Switch Replacement
by maninmac771 on Sun Dec 18, 2011 6:37 pm
#2 -- Ground connections for PAS-2 selector switch and input/output connectors
by maninmac771 on Sun Jan 08, 2012 1:08 am
#3 -- PAS Selector
by Pillo69 on Thu Dec 13, 2012 4:14 am
#4 -- Replacing Selector Switch on PAS 3
by jerdobi on Sun Jun 13, 2010 11:29 pm
#5 -- Source for new, upgraded selector switch for PAS3 upgade
by Elrick on Fri May 03, 2013 12:36 pm
I used the Forum's SEARCH function with 'pas selector switch' as the seach field (without the '....' single quotes. You can tailor the search info to suit your needs.
Also, somewhere I came across replacement PAS selector switch wiring info, I think by Roy Mottram of "tubes4hifi"....maybe at his website??
You can also do a google type web search for "replacement PAS selector switch wiring" and see what turns up.
Note: Either way, you will have figure out and know how the actual replacement switch functions. By that I mean which pairs of tabs on switch are the left and right tab for a position. I used a multimeter with a continuity test and connected two tabs by a wire with small aligator clips at each end. You could also probably use the resistence check on the multimeter with the same wire.
Hope this info helps,