No sound from the amps outputs

Question

I have a Onkyo TH-SR502 amp which was working fine until suddenly no sound were coming from any of the output connectors (including the phono jack). I got it checked by a audio repair specialist and he informed me that the DSPB (Digital Sound Processor board?) has busted. The code printed on this board is MCDG-8230/CMKM-P3X. Is this diagnosis correct? Or is there any known solutions that you know of that I can tell my repairmen to try.In case the solutions is to replace this board, can you tell me how/where i can get one of these please.Thanks in advance.