Don't know if anyone else has received a letter from GM yet, but I got one today regarding the problem of no brakes when first starting our GXP's. It's not a recall, but an offer to "calibarate" the brakes with something "improved." It's an option that you have to call your dealer and ask for - referring to TSB0-7-05-25-007B. Can someone pull up the TSB and see what it actually says? On the same note, I wonder what ...007A says.