I did a complete service before traveling. engine oil, filters, both fuel filters, air filter. Replaced exhaust system after engine brake. It is a Cat C7 with 61000km (about 45,000 miles). I scanned it and found no steady codes but communication errors in history with TCM and exhaust brake. I suspect a poor connection somewhere, there is some corrosion on exposed surfaces but am hoping there is someone who had a similar experience that can provide guidance.
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