Pachislo Slot Machine Fluorescent Light Board.  There are two sided by side inside door under the reel window that control the top and the bottom fluorescent lights.  Fits many machines including:

Arex

Azteca

Baby Angel

CC Angel

Continental XXXX

DJ Special

Final Mission

Frozen Nights

Getter Mouse

Ghost Rush

Hanabi

Jerokichi

Marine Battle

Million God

NJ

Tarot Master

Thunder Explosion

Ward of Lights

...and MANY others.  Will be taken at random from inventory.