Got them about a month ago with the EZ soldering kit and everything was fully functional after assembly until yesterday. Here are the following things I've tried to no avail:
1) Reflashing/resetting the affected PCB
2) Swapping out switches to make sure dead switches weren't the culprit
3) Reflowing solder to all diodes in the affected area, including the neighboring column
4) Disassemble and reassembling the affected PCB
Not sure what else I can try before requesting replacement parts. Any help would be greatly appreciated!