Gee lead you must have a different shop to the rest off us.
One of the things is if they won't to release an engine on condition it is the lame that take the responsabity of that. I for one won't do it and there are a lot of lames that won't ethier. Next is that the word recommend via the court says you must. Casa will not give you a definitionon the word how ever. I have tried.
Cheers