Say they were inflated to 12.5 psi, the minimum allowed, at 75°F in the equipment room, then taken immediately to be inspected, they would test normal and pass inspection.
Then they are taken outside at 51°F and set for two hours.
If, as you say, 10°F drop = 1 psi pressure drop, then they would indeed be 2 psi low...............
That’s the thing. Where were these balls inflated at? Did the Colts use outside ambient air that would have maintained pressure? It is getting hard to believe that they don’t have info out on this yet. One thing for sure, this affair IS drawing interest and making money. I normally don’t watch the Super Bowl, but I think I will this time...