If you're helping someone add this to what you charge them, if you're just fixing it for yourself I recommend getting it so you can accurately fix your own issues: Get an AllData subscription for that car's VIN#. It'll cost you about $25 for a year, and it includes ALL factory information (digital of course) that Ford has on it.
That way you can look up the pin-out charts, resistance values, and pin point testing procedures for testing the part. It also includes location info and description & operation on all the systems so you can get a better understanding of how it normally function before you get into it.
That being said, it seems the unit may be done; but it'd be a better idea to do some testing before you blindly chase a problem and throwing parts at it.
"I'm gonna sing the doom song..."