Control key is malfunctioning after full clean

Recently coffee got spilled all over my laptop. I immediately shut it down and did an almost full tear down (excl. battery because its glued in), and spent 6 hours cleaning it completely and ensuring there was no residue left over. After everything removable was taken out of the case I poured methylated spirits underneath all the keys and blew them out with an air compressor. After I put the laptop back together, everything works fine apart from the control key always registering at boot, meaning that none of the other keys can be used. It also does not register upon a physical keypress).

I use Linux so switching TTY's can be done with fn+ctrl+alt+f*, but upon trying I can do it with just fn+alt+f* because the control key is actived. After switching TTY's a couple times the control key seems to deactivate, and then I can login and use it just fine, unless the control key begins doing it again then which I have to repeat the same procedure (changing TTY's until it stops.) I believe this isn't a software issue as I have tried multiple distributions with the same result.

I have tried pulling the dome off and cleaning underneath the key etc. etc. to no avail.

Also on another note the two screw posts on the logic board side of the I/O cable shield broke off, and I shredded the CPU heatsink screwhole (Where the heatsink is attatched to the I/O board side.) (Not a problem but annoying) as I was pretty tired whilst putting it back together and used the wrong screws a couple times (I don't have a screw mat).