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Give it a spray of something like this as well and see how it goes, it’s ‘fixed’ a few things for me in the past.
https://www.halfords.com/motoring/engine-oils-and-fluids/lubricating-and-penetrating-oil/halfords-electrical-contact-cleaner-500ml-621335.html
Chaley
rhb
We got the dehumidifier under it & F7 is now C1 (weak fan) so I think I'm out of diy'ing it back to life.