A few months back I picked up a Jokerz which was in okay shape. It was a bit dirty and had never been completely disassembled so I took it completely apart, top and bottom, and did a deep cleaning "shop" job. It is now back together and playing great with 2 exceptions:

Problem 1
The drop targets don't always reset on a new game and don't always register that the entire bank has been hit. All the optos seems to work fine when I test them and all the drops register correctly during game play. However, on a new game, new ball, or new player, they don't always reset. Example behavior:

New game: If all the targets are up then all the targets work fine.
New game: say 2 targets in the right bank are down. They don't come up on the new game. Knocking the last target in the bank does not cause the bank to reset.
New ball: say 3 targets in the right bank are down. They stay that way until ???. I don't really know what ??? is but something happens where the targets register and the bank pops back up.

I noticed this behavior before I started my shop job so I know it isn't something I did. Also, I'd say the banks works most of the time. The problem occurs maybe 25% of the games. Any thoughts on how to diagnosis and fix?

Problem 2
When I press the flipper buttons two of the flashers light up. The flashers also light up when they are supposed to normally. When I got the game all the flashers on the playfield had 6.3V LED bulbs. They all worked and they did NOT light up when the flipper buttons were pressed.

I am a bit confused on the 6.3V vs 12V bulbs. When I was reassembling the game I tried 12V flasher LEDs but most of them did not work. So I put in in 6.3V LED bulbs and they worked and I didn't notice the flipper issue at the time. I don't think my 12V LED bulbs are rectified. So I'm guessing that is why they didn't work the first time and I just need to try again; reversing them if they don't work. Will this fix the problem where the flashers light up when the flippers are pressed?

(I checked the schematics and it says the flashers are powered by 25V. It doesn't specific AC or DC but I assume AC).

bump