Cm871 Jake solenoids inop

[dhirocz]

Engine brake solenoids suddenly quit on me.
The engine still builds boost to Jake… but neither solenoid comes on.
The engine was properly demandated and both the solenoids and the harness were replaced with new Cummins parts close to 300k miles ago when I inframed it.

Since both solenoids quit working at the same time, but I’m still getting boost, I am going to assume that I have an electrical issue, most likely under the valve cover. Is there any hidden relays or fuses that I need to be aware of I should also be checking for while I have things apart?