The lamp driver PCBs do not have to be removed, but all wires need to be disconnected. Each board has:

A 2-pin low voltage connector from the power supply

A small 3-pin connector, on the vertical daughter board

A 2-pin white connector, carrying high voltage into the lamps.

If removing the PCB, each one is held by 4x T10 screws.

The front driver PCB has a plastic insulator on one of its mounting screw posts. Be careful to not lose it!