Hey, I have a 3508 snack machine that is doing something that I haven't dealt with before. Every selection that ends with 3 will not vend or test vend (13, 23, 33, 43 and 53). I know its not the key pad because all of the selections that begin with 3 all vend perfectly. When I just thought i was dealing with one bad selection I swapped motors with another position and the problem persisted even with a different motor. I'm a little stumped, any ideas?