Sony provides only a phone number in Japan for camera repairs. Basically, you send your camera to them and they send it back to you after it is repaired.
Call this toll-free number in Japanese:
0120-222-330
Operator hours: 9 am to 8 pm (M-F) and 9 am to 5 pm on Sun. and national holidays
From cell phones, call 0466-31-2531
Web site: http://support.d-imaging.sony.co.jp/www/dslr/repair_service/index.html
