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Run the pistons down all the way on each cylinder one at a time and use the scope to view the cylinder walls.. Unless a piston's rings were stuck at the bottom of the stroke, you should be able to see where a ring may have been rusted to the cylinder wall. I'm still having a hard time believing that it was a stuck piston.
A compromise in the cylinder coating would not necessarily be a kiss of death so to speak. Disassembling the engine and having it dressed (blob honed) and the silicone coating reapplied would probably be fine. Provided they measure within tolerance and do not have any scoring. New rings too.
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