Looking for Bronica GS-1 repair/service manual

Hi.
I'm looking for a repair/service manual for Broncia GS-1.
So far searched through the net - nothing available for download or hardcopy purchase.

Any hints where it can be downloaded from ?

I was experiencing troubles with it today, however I suspect there is very few (if at all) GS-1 users here, so I would rather save the traffic not posting the long (and sad) story...:-(

Thanks in advance, Alex