I just thought about this. If the locked up pot is too far gone those CTS pots have a tolerance of
10-20% or so give or take. Even back in the old days when this guitar was made so perhaps if a replacement is needed until a vintage correct pot shows up perhaps you can get buddy buddy with the dude that runs The Art of Tone or whatever vendor sells 250k CTS pots and have them send you a 250k pot that specs out as close to 200k on a DMM as possible. With 10% tolerance you can probably find one that rates at 225kohm. Not exactly 200k on the nose but even if they still make 200k pots at CTS you’ll be hard pressed to find one that reads 200k exactly. Hope this helps.