The claim that apple gives access to parts is false they only give access to things like screens but expect people to send in the main board if that is in need of fixing which is prohibitively expensive to actual repair of components and adding a delay on actual repair instead of allowing board repair which would be cheaper.  And in the event the main board does need repair they just do a swap and erase the contents of the board sent to them. Apple do not fix they replace. They do not allow authorized repair techs to actually repair.