Good luck! I hope the pcm was not damaged during removal/install... MB connectors can be easily damaged by inexperienced hands. It may be helpful to give a detailed explanation to the tech as to what has been done. Finding a man-made problem can be hard to do without all the facts. As a tech, you look for things that fail.. not man-made induced problems. I always appreciate someone who is straight forward and help me save a little time.

Again-- Hope you get it straightened out!