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The issue isn't going to be piston rings on this engine. It will end up being one of the injectors being cracked and/or injector seals.
Remove the ICP, put shop air there and you will hear air on the rail. This is to confirm that you have a seal issue at minimum.
Remove the injectors and get them pop tested. This will confirm which ones are leaking.
You didn't post the year of your DT466 so if it is a early DT, it may just be the seals. If a newer DT, it may be seals and injectors. Either way, be ready to do the seals.
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