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My TPM system alarmed yesterday morning and showed 22psi on the right rear. It normally has about 30 psi. I drove to work and by the time I went home, it had 20 psi. I assume I have picked up a nail. I aired it up to 30 because I didn't have time to take it in, and this morning it was 27. I'll be taking it to Discount Tire where I get all of my tire work done. Are there any problems with repairing a tread puncture in runflats? I wouldn't think so, but just wondered.