The auto focus quit again. I reviewed pages 91-100 of the manual to be certain that some setting I made did not cause the problem. No dice, so I sent it off fully insured (with an AF50mm f1.8 lens) to "APS" Authorized Photo Service 8125 River Drive Suite#100 Morton Grove IL, 60053 USA (http://nikoncamerarepair.com) I may know something in a couple of weeks.
"Great things are not done by impulse but by a series of small things brought together." Vincent Van Gogh