Need help from service for PCG10/8016 generator

hello from Greece.
I have a PCG10/8016 signal generator…s/n 200607562 with problem.
Connect with my computer run the program pclab2000se .
The generator led power is on…but the led “ready” not respond.
Also the output of the generator not respond.
I have change the 3 optocouplers 6N136 but i have the same problem.
I need help from service please.
Can someone inform me where i have to send the generator for repair.
Best regards from Greece.
Apostolis.

Please return it to:

Velleman Projects Tech. Dept.
Legen Heirweg 33
9890 Gavere
Belgium.