I did a bit more searching the web last night and realized I’ll need to remove it from the board to see it better for the numbers on it and testing it, so the answer is most likely yes once I can get a better visual.
I did get it identified as a 1N4148, and luckily they had them at Radio Shack.
I replaced them and re-assembled the sub (tested the diodes before installing them). And no sound. I’m gong to have to t-shoot this better now. I had sound before I sprayed contact cleaner on the diode, so perhaps surrounding components are also failed.