First things first.
Have you raised a ticket with elektron support? Always follow their advise before listening to any of us forum users.
Ive repaired my OT my self, I attempted to replace some burned diodes, messed it up, and ended up replacing the entire UI board. Good news is, the board is cheap, very easy to install.
You can attempt to clean the switch with solvents or similar, personally Wouldnt try desoldering, that board is fussy.