They would take awhile to cool off...
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...............