Update:
I was able to update to OFW 3.56 without getting my console banned from PSN or Black Ops servers. I had to follow a tutorial to clear my log and game history switching over to the stock firmware of 3.55 and then upgrading to 3.56. It was pretty easy, but I wouldn’t like to have to do that again.
It would appear that I have successfully dodged the bullet, because I have read that if they banned you it would be right after you updated.
I’m not sure how many PS3’s were actually banned from PSN or if that was just a lot of scared little kids.