The keyboard is usually connected to the motherboard with a ribbon, and the touchpad with another ribbon. Stuff might have gotten into the connector and gummed it up. Carefully remove the ribbon from the motherboard, clean and reinstall.

On Wed, 9 Jan 2019 at 13:03, Tim Tisdall via talk <talk@gtalug.org> wrote:
On Wed, 9 Jan 2019 at 12:08, Lennart Sorensen via talk <talk@gtalug.org> wrote:
> Look up Louis Rossmann on youtube if you want to see what kind of repairs
> are in fact possible today and not that big a deal.

Yeah, those videos are exactly why I was looking for someone who does
what he does.  But it does seem to be a rare thing.  I think my issue
may just be the keyboard, but I don't think it's possible to open that
part (and, of course, it's underneath everything else just to see if
it's even possible).  I miss the days where the keyboard could be
pulled out from the top without having to even open the casing.
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