I’ve been troubleshooting my Sing Along and think one issue relates to the ones score reel. When the machine is running and I trigger one point scores the machine has trouble getting back to zero and tends to blow a fuse. When I work the reel manually it moves freely and clicks to the next number, until back at zero. At that point it will not click and move forward right away but does after 4-5 tries. This had been working fine until recently. Could this be an issue with the nylon gear and rack or something else? Opinions welcome!