Ditto for the exact 3 screws mentioned on my 2008 2551. Mine were sheared off & I found the remaining pieces still tapped in to the metal the door frame was mounted on. Will have to get the pieces out & put in some stronger screws.
BTW - the more I read on the forum the longer my PC "honey-do" list grows; but its all good & the mods/fixes only serve to increase my sense of security at properly maintaining the unit. Thanks again all!