When I had this issue on a few machines I would put the game in switch test mode via settings. If I did not see a switch stuck, I would still test everything till I found a problematic switch. Other times, it was a loose wire making contact with a switch etc.

Just check to see if you have any acid damage in the area I highlighted. However, the problem sometimes is behind the board and will look fine in front.

Another thing, try lifting the playfield and keep it up while you turn the machine on. Many times a wire gets pulled or pinched when lifting/closing. Inspect all around the sides for any wires that could have been caught. As well, look at every switch as well confirm they all are snug and are still connected.

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Whenever you have issues with a pin. The first step is to check for a loose connection, bad connector or a rogue wire. Very often it will solve or point you in the right direction.

-Lubricating? Are you talking about waxing your playfield? If so, Buy this: https://www.amazon.com/Wizards-11033-Shine-Master-oz/dp/B005ZH10O8/ref=pd_bxgy_263_img_3

It is the best wax in my opinion.

-If you go to a glass shop, they can cut a piece of tempered glass for pretty cheap. By me its around $25, but ask them to bevel the edges so you don't cut yourself. If you buy from an online pinball store it will be around $90 (Before shipping/tax)

- LED's are a fan by many, low power, no heat, last forever. But don't expect to get any of your money back when you try and sell it. I wont play my pins till they have LED's. Personal preferences.

- Advice, learn how to solder.