If you have a problem with a link in FAQ section, send a personal message to Glen (Soaring) with the specific link and what happened. There may be some that have been removed and you got a default message indicating that. Most of those links Glen has collected over the years and he as a site administrator has kept them up.
If you, or anyone else for that matter, finds a technical link of interest to Mustangs, let Glen know. He will do his thing and if appropiate, will add it to the list.