You are getting the run around. None of the work done is in accordance with official Tesla Guidance, i.e., the service bulletin.
If they are seeing the problem, the only approved solution is daughterboard replacement.
You keep saying that, but the TSB specifically only covers errors/alerts that are logged. It doesn't say anything about applying to locking up, rebooting, etc. How do you know that they are experiencing one of the covered errors?