hmmmmmmm
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hmmmmmmm
The valve stem portion of the TPMS sensor could be leaking, same as any other type of tire valve. You can buy just the stem, from Ford the one to go on the sensors used on your car retail for about $40. Not sure if the aftermarket is doing a less expensive replacement yet, I know they're out there for the older style sensors used on the S197s for about a 1/3 of the price of the stem on those.
cheers
Ed