I own a Model S and I had the message pop up randomly as well. The service center mentioned that there is a problem with the placement of the antenna of the system and after they tries to fix that they ordered a new antenna. I haven't seen the message for a while now though. As always the Seattle service center was excellent.
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Comments
Maybe the testing overheated or shocked the sensors in some fashion, and it's nothing. But you still should have verified their pressures.