I think I may have this fixed. I will know for sure in a day or two. First, this forum is great. I was able to read some old posts and some of the advice given in the past and determined I may have bad reel switches. I took a multimeter and check continuity on both swithes and 99% of the time they operated perfectly. It was that 1 % where the switch would chatter and cause a 41 or 71 fault. I ordered new switches from Slotmachinerepair.com (Klar is great) and installed them today. I had to do a little adjusting but I just played it for over an hour without error. I also changed the battery on the RAM board. Mine was dead from being 20 years old. I went with a NiMH battery. It is a 3.6V three cell emergency exit sign battery. It has 8 inch leads so I cut off the connector and soldered the leads to the board and then mounted the battery next to the MPU board. I seems to be happy.