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Yep, go through all the connections cannot see anything obvious damage or disconnected, really puzzled, and the worst thing cannot find any good mechanics specialize on zf transsmition.

Not sure where you are located, do not have your location in your signature but Precision Transmission in Colmar PA is supposed to be the place for ZF heavy duty transmissions. I have not dealt with them personally but they are highly thought of over on the Wanderlodge forum. 

My only experience is rebuilding a ZF for my car, have not messed with the big ZF's yet. I know they are particularly sensitive to all the parameters being exactly correct, they do not like idle speeds that are too high etc. 

BTW what is the transmission model is used in your coach, this might help to know as well. Should be a data tag on the side of the transmission to tell you the model.