Ratfink11,
A couple of years back I had the same problem. I didn't even know it was flat but a friend saw it and let me know. I thought I'd picked up a nail but when the tire guy checked the tire it was simply the valve. Tightened it up as well as checking all the others and it has not been a problem since. Unless your valve continues to leak I doubt you need to replace it.
I just installed a Pressure Pro Tire Monitoring System and one of the things that they warn you about is that the sensors MUST be activated for the sensor to work correctly. So far all seems to be working as they should.
Good luck and travel safely, HamRad
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