Seen this at the JP site.
Originally posted by another user
Schedule service restart
Phased out according to the schedule below for each region "PlayStation Network" service will resume.
For specific dates, we will guide you turn at this site.
Guide update (today)
Enable password change "PlayStation 3" System Software Update ver.3.61 (soon)
* At this point, "PlayStation Network" is not yet available.
"PlayStation Network" restart some services (soon)
Liable for the service will be resumed ※ "will resume soon" PlayStation Network "service / feature" please see.
Getting signed - will need to change your password.
- Change the password by performing the procedure, "PlayStation Network" are some of the services can use.
"PSP" "PlayStation Portable" With regard to the password change, "PlayStation 3" I will guide you through the timing made it possible to change the password.
"PlayStation Network" full resumption of service (in May)
Don't know if it's already been posted.