Boost leak CM870......check engine light?

[trucklogger2]

With your park brake on, hood open, rev engine to around 1400 rpm on pto, then go around all your charge air boots( rubber ones) including the small one at intake manifold (egr pipe) with your two handss around the ends of them so that you can feel air leaks if any from these joints. And listen also and feel all around your cooler.