[Zig]

I'm sure you've done this anyway but just in case: I'd always try a squirt of Servisol(not WD40) in the back of the pots.
Ahyes indeed: the regretted selling of guitars...the regret that cuts in increasingly 20+ years after, when we ascertain how much they've accrued!

I was speaking with a friend only last night about shared stories of the same: in his case a particularly tasty Gibson SG of a certain year that he flogged at knockdown, only to find many years later that prices since soared for that model.
My own sad tales were(are) passing over a 70s Ibanez Artist some years ago though it wasa mere £40 or so. I also bought in 1986 a Japanese Squier strat(they went Korean the year after), flogging it dirt cheap in the mid-90s. With angst I realised a couple of years ago how sought-after these have beome.
However, the upside is the joy we had of owning/playing them when we did...and if we buy/sell with wisdom we get both a good instrument and an investment that doesn't depreciate. Usually.

Ah..delightedly I've now sold the Les Paul and the Japanese strat, both I and the buyer happy bunnies! I'm so pleased, as I'm not a wheeler-dealer by nature and selling guitars is something that doesn't come easily.