Fan works great but have lost inside/outside air switch, AC switch, and rear defogger with no LED lights. All circuit breakers, relays etc. test ok. Bought a new control panel, plugged it in.....same issue. Could be original panel failed and replacement (new model 599-210xd from Dorman) is also bad out of the box, but what are the chances? Any ideas as I really don't want to pull wire harness if I don't have to.