Warehouse damage?

Hello, yesterday I stayed on the way to work with my 91er 900er convertible. I uncoupled at the highway exit and a little later the engine went off and did not let itself start again. Start attempts ended either with noises similar to those of an almost empty battery or with a simple “crack”. A “yellow angel” has diagnosed that the engine blocked (even at the time of the engine still turned at start attempts). My Saab dealer typed after e In order to confirm this diagnosis, he would of course have to expand the engine. Should the diagnosis be confirmed, according to his statement, a new engine would be due. Do you have any experience? Tips? Ideas? Thank you very much and many greetings o.li.