ZL, Minus, and volume buttons stopped working on Switch Lite

After attempting to repair the left joy con for my switch lite, I reassembled the console to find out that the ZL, minus, and volume buttons have stopped working.

On the same board, the L, power, D-pad, and screen capture buttons are working fine.

I am thinking that I might have damaged a ribbon but I am not sure which ribbon is the culprit here. Does anyone have an idea?