Vintage Synth Repair

hello all,
i'm thinking of maybe selling my Jen Synx 508. It is a very rare 
italian 8 voice polysynth, maybe only few were produced as Peter 
Forrest say in his book. It is not in working order and not 
cosmetically good but there are 24 working CEM IC inside. I think the 
problem is probably due to bad contacts in the connectors of the 
boards. I have the schematics.I Ask 500 Euro, located in Trieste, 
Italy.
Ciao
Fabio Delben