Some models of electric hollow-body / electric arch-top guitars do not have seem to have any kind of access to the electronics (switches, pots, caps, wiring) beside the "f" shaped sound holes.
I have seen guitars with no pickguard on the front of the guitar, and no plastic plate which can removed with screws (like on a Les Paul). For example this guitar : http://members.shaw.ca/jeffflowerday/Images/PRSArchtop.jpg.
How are these guitars electronics parts serviced ?