Re: Cylinder Scoring
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To be honest, at this age of the engine, unless you've driven around the world a few times, there should be 0 (ZERO) scoring. Any scoring should result in a replacement. Actually, is a well cared for engine, 2 laps around the planet should also show 0 (ZERO) scoring.
Also:
I would tend to want compression and leak down tests performed on all cylinders before it coming apart. Before doing it, ask them what is normal for this engine. Depending on the results, that could give you a better reading on the cylinder walls and rings health than a visual.
For the leak down, good chance at TDC is not where you want it tested, though that is where it is usually tested. A test at TDC and again at 70 - 75* ATDC might be more meaningful in this situation. They just need to make sure to keep rotating the crank in the direction of normal operation. Reversing the crank can screw up consistency in the results.
An independent authorized mechanic (if there is such a thing for warranty purposes) might be the best place to start.
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