I have a DD deluxe with a SC6602 MEI bill exchange. It has recently stopped working and showing all three lights (red,green, yellow). I have tried everything but due to the fact I'm cheap and someone who likes to learn, I'm asking for help to troubleshoot it. I also plan on upgrading this machine to a DD haywire but need to fix the bill exchanger first. Any help is greatly appreciated! My wife and I are RN's and during this covid crisis and have found enjoyment playing this machine and now I can't even load credits due to non-functional bill exchanger. Understand I'm a technical person and can fix almost anything in the house but this being my first slot machine I relying on you guys experience before I go breaking things. Again, thanks to anyone who has suggestions or helpful ideas!