I have a 12C and 16C, each with one mushy key. I opened the 12C today (I'm using my 12C for practice and will crack open the 16C later if everything goes well) and un-staked the PCB, expecting to find a puncture in the little rubber pad between the back of the keys and the snap domes. The rubber pad turned out to be fine, but the snap dome behind the FV key feels weird. It doesn't have as pronounced of a snap as the other domes, but otherwise it looks fine.
What would cause a snap dome to go mushy and is there anything I can do to fix it? If there's no simple fix for the bad dome, I was thinking about trying to cut the bad dome out and switch it with the pristine dome at the bottom of the enter key. Are the domes simply taped above the proper spot on the PCB?
I would really appreciate any advice on how to proceed here.
Thank you!