[masraum]

Ouch, that sucks. I would mention everything to them, including that the only reason that you broke your cardinal rule was because you were confident in the car, and that someone has done things to it that have compromised the reliability. Don't do it in an accusatory way, maybe that someone is messing with them or if they took it somewhere that someone else did something, make it seem like it's completely nothing that they did but that you are aware of it. They should then realize that they should quit screwing with it or letting someone else mess with it which seems like a possibility.