I have a pool pilot digital dg-220. our main power supply to the system had to be replaced due to a mole. It is now replaced and when we turned on the pool pilot the display is unreadable with letters, numbers, and symbols. I was told the display board has gone out. Is that what happens when one does? I checked the wires going into it and they look good. The pump is wired into the pilot and it still shifts from high to low automatically. How hard is it to replace?