can't speak for Goatdog...but I'm guessing the same reason I have fixed various things on my stuff. Haul to dealer, drop unit off, wait X number of days. For mobile repair, have person come out between the hours of noon and 4. call cause they're late, arrive, not have the right parts reschedule.
Or option Me: spend a bout 15 minutes fixed part myself and gaining a better understanding of the inner workings.
PLEASE do not send questions via Private Message, my inbox fills up too quickly. Post questions in the forum as a new thread so that other users can benefit from the answers. Use Private Messages for sensitive information only (VIN, Contact info or things you do not want the public to see).