I have a 2014 short wheelbase. The electric power assist died at 63,544 miles in July 2019. A Ford dealer in the Cleveland, Ohio area quoted about $1900 to replace. The big cost of the job was the price of the rack itself at $1300. The rack cannot be serviced, just replaced. The rest was labor and an alignment.
The part number for the rack is HV6Z3504EV. The rack does has a core charge.