You need to have a cylinder leakage test performed as well as a compression test .This will answer your question about your rings.On cylinder leakage test you can varify if the lower end is ok . I would perform this test if there was any question about lower end wear.
good luck,

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euro 287
Mercedes Technician 7 Years (retired to Hyundai)
2000 Dodge Durango
98 Mazda truck