Pay a totally independent licenced engineer familiar with the type for half a day of his time to go over the whole aeroplane and paperwork and estimate the time, cost and aggro of getting it CofAd again.
Check around your home field to find an engineer to do the inspection. Yes, you may have to pay his travel and accommodation. I would not in any way rely on the engineer who has been maintaining the a/c. You need a fresh pair of suspicious eyes.