Quoted from the4horse:
Perhaps those two wires on my slam switch are yellow, not white. Still not sure where this light blue/black stripe and orange/black stripe wires go but they do look to belong on the coin door somewhere? Thanks for going to the trouble of looking though.
The manual and, as you've indicated, IPDB show the blue/black and orange/black as being the correct colors for the slam switch. This switch is wired in series with the ball roll tilt switch (orange/black wire). As others have said, you need to look around (on the tilt board, bottom board, head) for evidence of the hacks - those wires being spliced, the source of the new slam switch wiring, any additional wiring tie wrapped to existing bundles and other general monkey business. You have said that the insides are in good condition, I'd think the changes would stand out.
This certainly qualifies for the hacks and door bell threads!IMG_1768 (1) (resized).jpg