I'm confused .. what are they saying caused the scoring? And are they just saying "compression / leak down is fine, it's not a big deal"
To me, scored walls are caused by A) foreign matter in combustion B) bad rings
I think you may have something more serious going on, e.g. failing turbo, failing rings, and they're kicking it down for now. I'd at least want to have an [educated] conversation with the tech, not the SA.
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