Just joined the club with a HUO Premium for my first pin. The playfield is filthy so it's a little slow right now, but I plan to get in there and clean it up this weekend. I also have a pop bumper switch that isn't working but hopefully it's just something shaken loose from shipping. Got a few games in and was struggling just to complete a house, so I'm definitely in awe of some of the scores you all put up!

I'm having the first maintenance issue I can't figure out on my first machine and wanted to sanity check this with some more experienced folks to make sure I'm headed down the right road:

The left loop rollover was not registering so I replaced it and it seemed to be working ok for a while. Then my dragon kickback wasn't firing at all, or firing late when the ball was on the way back down. The kickback worked in test mode but the opto was registering intermittently in the switch test so I replaced that, but no improvement.

Now during switch test everything will work perfectly for a few minutes but then the rollover, opto, and the targets on each side of the left ramp will stop registering completely while other switches work fine. Then after a few minutes everything goes back to normal for a little while before they stop again. No errors are reported to include the node board tests and I tried reloading software but the problem is still there. All of the affected switches are on node 10 so I'm thinking that may be the culprit? Is there anything else I should try before dropping $200 on a node board?

I had already tried cleaning and then replaced the opto. Today I swapped the node board with no improvement there either. I ended up finding a wire on one of the ramp targets that was barely hanging on. Once I re-soldered it all of the flaky switches started registering as normal, so I'm back up and running!