One of the codes he got was P0057. Sounds to me like one of the O2 extensions (solder point) may have come loose. It won't be that difficult to get to them now that you have done it before. Take them off and inspect. I have put about 400 miles on my LTH so far with no issues. Knock on wood!
Steel wool trick is a good idea. It worked for me on my S2k for a while. Eventually burnt off though.
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