I've been experiencing a slow leak on my left rear (tire). Took it to our local Goodyear Tire Center yesterday on Richmond Road and they told me they could not find anything wrong, but oh, BTW, my tires were "dry rotted" and needed to be replaced. Yeah, right. Today I took it to my usual tire shop (Howard Motors/Williamsburg) and they told me the TPMS was leaking at the valve (and they even showed me the bubbles) and that I really should take it to the dealer to have the module replaced. And, they told me my tires were just fine, otherwise. They didn't charge me a dime to find the leak or for the advice. It's nice to know there are still some honest shops and competent people out there.