The last mistake you made was releasing it...you should have left it on shore would have made it easier for the snapping turtles to feast on its Dead carcass...
Here's what I did to mine....ripped out the wires for the C batteries and rigged up a 50 foot length of wire and hook it to a Car battery ....lasts for the whole season
Assuming they examined the turbo for Bearing failure ..and didn't find any , may have led them to beleive a foriegn object was tossed in the air intake ...........
90% of the time a turbo disintegrating is result of bearing failure ...