Peter,
I realize this is a difficult situation for you. It seems to me, you have two options: send it back to the vendor for a refund (if he'll take it back) or send it to someone qualified to rebuild it. Option #1 is the better choice as Option #2 could be a bitter pill to swallow. After all, these gearboxes aren't cheap to refurbish. Have a talk with Roland Jaeckel. He'll know someone who's qualified to rebuild a ZF and he probably knows the guy who sold it to you too. His insight in that regard might help. Lloyd Butfoy (RBT) could probably refer you to someone in Europe who's a qualified ZF technician, if you aren't comfortable asking Roland.
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