Well its not down for me, just go search the error code on the internet, sometimes there's a reasonable answer to these questions. However, if PSN is down then its probably just a regular maintenance check, what with the recent attack on PSN they will be doing frequent checks on the network just to make sure everything's in order.
Oh and a little bit of advice, next time instead of making a thread about such a simple matter that will get closed, just go ahead and ask someone in the SB, or like I said earlier just search the error code. Its like me making a thread saying 'WTF IT JUST STARTED RAINING AND IT HASN'T RAINED FOR A WEEK', its not really necessary :p