As you may see one of the switches is completely busted. It has to be replaced!

There are few replacements out there. I've used this one. But you might want to use original one. Or the rival one.

It really does not matter much. The difference is operating force. The original one comes with 75 gf which gives lighter clicking action. But I went with 150 gf for the replacement since those should last longer...

Take old switches out. Might be a little tricky! You might want to use multiple soldering irons to heat all 3 pins at once. Or heat gun. The choice is yours. Just be careful not to burn yourself! FYI, this is probably not the best project for the first soldering experience!

Solder new switches on.