CAREFULLY unplug the NINE (circled in yellow) connectors that connect the key/light board to the main board.

Some are ribbon style and slide out with the little bit of ugga-dugga (very little), the others are more typical connectors. None of them are as delicate as the LED one you dealt with before so this should be cake.

The main one of interest is in the upper left that connects the LED lights to the main board.

Now slowly and CAREFULLY lift the keyboard away from the main board and set the main board aside.