A bit of info on the switches: The M0110 uses Alps SKCC "Cream" with an SKCC lock for capslock. A fair bit of M0110As actually use the same switches however the A has a bit of variation in that some have a Mitsumi or SMK-made switch. Easy way to check is the Alps one has a tall off-white stem, Mitsumi are white and SMK are black. 

Here's some pictures of one of the linear SKCC switches being taken apart, could help with fixing non-responsive ones. http://i.imgur.com/W9ib8a4.jpg and http://i.imgur.com/UFB1JAW.jpg  (from: http://imgur.com/a/BUJCJ#d73rvGq )

I'd assume a decent alcohol-based contact cleaner would bring the switches back to life. If anything like audio gear years of dirt\poor storage\moisture causes switches and pots to be very temperamental, fix being a contact cleaner. The usual in the audio world is deoxit however that stuff's expensive, a generic one would work fine for a keyboard switch.