[JHerbster]

I have a double wall oven that I purchased used with the knowledge that on the digital clock the last minute digit did not work except for the bottom line on the digit LED array. The middle digit, the tens digit, has only one of the seven LED bars that is not lighted. The previous owner had the control board replaced once and the problem was temporarily resolved but it came back. I would like to solve the problem but I am doubtful that it can be permanently fixed by replacing the control board (part#7316516538) again. What else could it be. Is there a power modlue that is not working properly and how do I test for other problems? Thanks for the input.