If you are certain that the heater element is bad then change it My suggestion was for you to test it to be certain it is bad. If the element tests good the problem could be in the board. At least you will be certain which component is bad.
2004 Jay Feather 25E
2001 Ford Expedition 4X4 EB 5.4 3.55 rear
2004 Ford Expedition 4X4 EB 5.4 3.73 rear