MFA issues, couldn't find in archive or searches

MFA used to work really well, then sometimes I had to press it harder, and harder, then it stopped working. Anyone shed any light?
Maybe fuse?!

wouldn't think so - not the fuse - sounds like dirty and (now) bent contacts in the switch - that's where I'd start

M

sorry to sound like a novice, where would I find the switch? Should I source a new stalk?