Looking at your photos, 7th one down with the very rusty switch stack bolts. Sometimes the corrosion will cause shorts through the bolts and plates. Not always easy to find, but if you have one that is suspicious like that it may need to be disassembled and cleaned - or better yet, replaced.
New! Dark mode!
Browsing Pinside at night? Getting tired of all the white? Switch to dark mode using the button in the top right (or CTRL-B)!