E120B CAT Swing Brake

[Maui Gulch]

I am not able to get the swing brake to release. It worked fine a few days ago and now all other hydraulics work except the brake is preventing swing control. Any thought on where to begin, is there a solenoid or fuse?
Thanks

 

[Per Eriksson]

You have a solenoid in the pump room on the pilot manifold and a pressure switch on the main valve body.

The solenoid have a black wire thats grounded and a green/black that's hot when swing brake should release

The switch has a green/blue wire feeding from fuse 9 and when closed(swing release) making a yellow/black wire hot.

in between there 2 relays and a switch but start with these 2.

 

[Maui Gulch]

Thank you Per. I will give a look at this when it stops pouring rain.