If you're repairing a '530, have a look here (about halfway down the page):

http://www.k4eaa.com/parts.htm

Since the thread started I managed to acquire a TS-530SP, two TS-830S "Gold Label" units (one a project rig) and enough spare parts to make things...interesting. Look at our "Mods and Repairs" area of the site. I'm going to start a mod/upgrade thread for both rigs. There's common DNA between the two (PSU, RF, PLL and Counter Boards, final assemblies) and many of the mods destined for one will work for both.