there is definitely a switch out of adjustment on the 100 point score reel. I would read about what the reel should do when it is in the 0 position. There is a switch that opens when going between 9 and 0 that is probably not opening. I would take that reel out and manually cycle through the numbers and watch the switches especially when going from 9 to 0. Also take out a working reel and compare the functions of the switches of both reels.