There are some PW manuals here: http://www.classbforum.com/phpBB2/viewforum.php?f=43
and links to RT manuals.
Maybe reading one of them will give you an overview of the items and processes commonly found in all Class B brands.
Also, ask as many questions as you like
. Post photos of parts or valves etc that you have questions about. The members here can be your manual
To everyone reading this - if you have downloadable copies of owners manuals you can post them on the link noted above. This site has plenty of storage space to host items like that.