Desperate for Part for Onkyo AV controller

Hi, thanks for reading.  I've got a customer with an Onkyo AV Controller PR-SC 885.  It needs a new processor board.  Onkyo's factory repair center in New Jersey says the part doesn't exist any more.  I'm looking for
part no.1B170514-1A-P223A2

Please help if you can.

Thank you, 
Steve Palmieri