Yesterday i took it to a tire store recommended by a local dealer. They said the tire was ok and the valve was loose which they tightened.
But last night I dropped 30 psi in the 12 hours since I had left the tire store
This morning i went to a different dealer. They worked me in the day before July 4th which was very much appreciated. They said the valve was cracked so they replaced it (not sure if that would be considered a warranty repair but I paid out of pocket).
Hoping that was the problem and its fixed as we have reservations for the holiday weekend - but obviously wouldn't go with a tire leaking that much.
Crossing my fingers until I check the pressure tomorrow morning.