RQ: dBTechnologies DVA T12 schematic / service data?

Hello,

I'm looking for schematics / service data for dBTechnologies DVA T12 amplifier module. It stays in protect mode and doesn't want to switch on main PSU.
One green LED on the PRE_MAN_BOARD is flashing five times, pause, five times and so on. On the PSU board only the LED2 is on (PSU auxiliary 5V is present).

Thank you very much!

Best regards,
Boris.