the P1 punch2 looks a little weird. might just be bent. i would try and make that a little better and straighten it out.
also run a pencil eraser over the contacts of the board. it'll shine them up nice for a good connection.
I'd also take a small flat bladed screwdriver and just push up on the contact of the connection a tiny bit to get more spring tension on the contact. i normally use a 45 degree o-ring tool, but a small jewelers screwdriver will work.
failing all that, i'd look into just swapping out the microswitch on the non-working input. those get stuff in them and also with lots of them having silver plated contacts, get tarnished and stop working all the time.