Diodes look correct, but I see a lot of other stuff I don't like. The good news though is you now know the problem is right in that area.
In the first photo the diode should not be in-between the playfield and the switch. Who knows what it could be touching, or the lead even broken. The solder joints aren't horrible, but not good either. I've never seen a switch quite like that and can't tell which is the NO lug and which is the NC lug. You could check that to common with a meter.
In the second photo the copper piece that the green wire is soldered to shouldn't be curved around like that and looks like it could be touching the other copper piece. Solder joint on left is not great and the one on right could be a cold joint. I would compare the lug connections to another leaf switch and make sure they match. Added image of leaf switch connections below (wire colors are different so go by row and column labels).
I would probably replace both switches and wire them up cleanly.
Another test you could do on the switches is (game off and meter on continuity) one lead on common and one lead on normally open and make sure you get continuity when you manually close the switch.