You have another board i have a 820-0174-c but i see a scratch between the ROMs and the connector and because the board is green and not really flat i cant tell if the scratch has broken the trace.
If it was not as tight i would use pencil lead to try to give the trace more conductivity but that would just make it worse.
I only do that for corrosion on old games. Would the ROMs cause the blank grey screen and no boot sound?