http://www.cbssports.com/nfl/writer/jason-la-canfora/24981269/some-baltimore-ravens-think-footballs-were-under-inflated-vs-patriots

While the balls are supplied by the home team, the Ravens would have kept their footballs on their sideline, no? Also, how would the kicker not have been able to tell when they went out there. The Colts supposedly could tell during an interception.

If the Ravens have a problem, it would seem that the footballs that the refs okayed before the game were underinflaed. In that case, it's exactly I'd say the error is on the side of the refs.