Cancel TVIP in Tecate
This was pretty much as GoingPostal has said. The customs/immigration/and Banjercito are all together in a building to the East of the road that leads to the crossing into the US. This building is located, naturally enough, right where you enter Mexico. There was a long line to get into the US, I went to the front of that line and asked the soldier where the Banjercito office was. He directed me the wrong way on a one way street but no one seemed to get too exercised about that. You do indeed have to walk up to the window of the half round office and knock to get the attention of the staff. The first guy I talked to told me that they could not cancel a TVIP there. I explained that I had called the main office and they told me that I could. He went into the back and another guy came out and said that first I had to go to customs and they would look at the bike and sign off and then I would bring the document back to Banjercito. Both officials took photos of my VIN stamped papers and off I went. I was allowed to go right to the front of the line to enter the US and was asked a few friendly questions by our ICE guys and I was back in the US.