I have an 06 2500 6 speed. I recently had a fuel line burst. After that my truck would randomly start going in and out of 4wd. I cleaned every connection I could find. Yesterday I was driving it and it went into 4wd and gave me the error SERV 4WD. Now it won't disengage. I went to manually unlock the actuator to find it's not on top of the axle or anywhere i can see. Does anyone know where the actuator on an 06 is and how do i manually unlock it until i can start tracing down the problem?