Court Acoustics GE60 EQ wiring question

[Pytchley]

I have one of these very nice old EQs. There is a circuit board for the in/outs which has 4 sockets for optional transformers. These are not present and in their place are multi pin plugs. These seem to be wired asymmetrically at the moment and plugging in symmetrically wired xlrs cuts the signal right out. Using asymmetric jacks works but the signal is much reduced. I have posted photos at Flickr: pytchley131's Photostream . I have searched for wiring instructions but have only found a sales brochure which says that they are easily reconfigured internally but does not say how. Court seem to still exist but don't reply to my mails. Anyone know how to rewire these things or where to get the transformers? Any help would be much appreciated.