said by An_Onymous :

Beyond that, not a whole lot you can do as the main SoC is likely a BGA parts as least in the case of the ST-516 V6.

said by An_Onymous :

Not like you can order the big SoC easily from the vendor easily or that replacing the BGA would make any economic sense for you.

I would recommending looking at the driver/receiver chips in your bone pile. That's the soic-8 right next to the sticker SB10A in picture (ST516V6). It should be very common froml the analog chip vendors were selling their DSL driver/receiver chips - fancy opamp parts.

You are looking at a $1 part and a 2 minutes replacement job.