Have you insisted that the Chrysler Technical Rep. be contacted? I am sure that you are not the first person to have this trouble, so the Chrysler Rep. should have access to all reports worldwide on his computer.
My wife worked in the service department of a Chrysler Dealership and she said that the dealership was always reluctant to ask for the Reps help. She did not know if it was because of pride, that guys do not like to ask for directions, that they were invoiced for his help or he could tell the dealership to do it under warranty. They of course would prefer you to pay the higher rates not the warranty rates they are paid.
All problems like this are recorded on the computer, the solution(s) to the problem are on record. This is what the Rep. does, he also has the final decision on who pays what. Insist on speaking to him, and tell him your side of the story, get him on your side now or you could pay the whole cost. This man will have access to more info about Xfires than any mechanic whose taken a few courses, if indeed there is a mechanic who has taken a course.