Help finding Circuit Board for Sony SRS-BTX500

[RockyJ]

Greetings, I dropped my BTX500 and thereafter was able to run the volume down, but not back up. I disassembled and have troubleshot it down to the Top Key BD circuit card. There are a few (part?) numbers on the card ("SR7739" , "271-ST0220-B10X0" , "S711-3887-1E20") none of which produced results in my Google search. It would be an easy fix if I could just find a distributor and buy the board. If anyone could help me locate one I'd be very grateful. I'd hate to shell out the coin to have an Sony authorized repair center do it for me. I'll attach a photo of the board I'm referring to.