Does he say based on his “finding” that some type of government agency could force him to give you a refund (or at least put a judgement against him)? Is the finding going to say that document fraud and inspection fraud was uncovered?
In regards to the compression fitting issue,before a issue like this turns into a criminal situation any businessman would simply replace the line with a new one without a compression fitting repair, issue resolved.
What is the reason you should recieve a full refund in this situation? Again you have a investigator saying your car is high priority because it is unsafe to drive and then you say the investigator says it can be driven with compression fittings (is there now more than one?) What is the issue that makes your car unsafe to drive and who is making this conclusion?
Keep other issues (like the car stalling) out of the rufund/unsafe to drive issue,it makes your case appear like a simple case of buyer remorse and a buyer who is simply unhappy with the deal they got and is looking for a way out.