CM2350 Injector Driver Codes

[Bigballercarhauler]

Hey guys, had an overhaul done bout 5k miles ago. Ever since I’ve gotten it back I keep getting fault codes for injector driver out of adjustment. Originally it was throwing cylinder 1. We did an injector relearn and now it’s throwing cylinder 5. Today cylinder 6 came on as well. Cylinder 5 came on and immediately went inactive today. The harness under the valve cover was replaced during the overhaul, and the tune was redone afterwards as well. That’s the only changes we have done. Truck runs smooth when codes are active, no performance issues. Planning on pulling the vc to make sure the nuts are indeed tight and that the harness isn’t pinched. Anything else I should check?