Engine brake problem on D12c

[ClintBarton]

Hi,

Does anybody know what can cause both engine brakes not to work? ithey worked until i parked it for about 24 hours, and it stopped working after that/ i have gone through the entire harness, and 12 volts does get to the solenoid, but when i jump a negative wire straight from the battery to the solenoid i can hear it clicking. both the the EPG and compression braking stopped working. took it to the volvo dealership in town and they cant figure it out either, but according to the guys here the mechanics at the volvo are just street mechanics that dont know jack
any ideas?

Please help.

I did not find the right solution from the Internet.

References:-
https://bit.ly/2uIsfJV
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Thanks!