Chased an SD70ACe last Tuesday throwing intermittent injector balance faults at N8; EM2000 looked fine until a PicoScope on cam/crank exposed a broken shield in the governor harness. I want to deepen ECM/EM2000 and J1939 CAN troubleshooting — any recent courses you’d recommend with real bench time and scope work, OEM or third‑party? Quick tip: a 500V megger on sensor pairs and confirming 120Ω across the backbone saved us parts and a callout.