These issues are usually connector related. If the lamps driven by the main lamp board are working, buying another main lamp board isn't going to solve your problems with the Aux lamp driver board.
Make sure the Aux lamp board is getting power, hook up a multimeter (set to DC voltage) with the black lead onto test point TP2 and the red lead onto test point TP1 on the Aux lamp driver board. You should read about 5 volts.
If power is ok, the next single point of failure is the "lamp strobe #2" signal from the MPU board to the Aux lamp board. This is a grey wire from MPU board connector J1 pin 8 to the Aux lamp driver board J1 pin 3. Wiggle both of these connectors with the game in lamp test mode and see if the malfunctioning lamps start working
There are other signals from the MPU board to the Aux lamp board used for selecting lamps, but a bad connection on any of these other signals won't cause all lamps to not work from the Aux lamp driver board.