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MarkM,
1- Inspect the prechambers for cracks. Repalce any with cracks. You can clean then up with a wire brush, wire wheel, or bead blast them. Get them as clean as possible inside & out, with no residue left inside. The "spherical pin" inside should not be "burned or scaly" according to the manual. Don't confuse that with carbon deposits, though. Only replace bad ones - which you would do anyway, given the cost, ~$50/each aftermarket (nearly $100/each at the dealer!)
2- Pistons should not have visible damage. Carbon is normal. Cylinder bores should have pretty "cross hatch" pattern visible. Basically you're looking for obvious damage. Also look for water damage, where a leak caused the block or liner to get "eaten" by steam or corrosion. Not likely to find that, though.
HTH,
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