actially replace this single ROM on the PCB for the test
http://mamedev.emulab.it/haze/misc/eprom_2_vr_alpha_denshi.zip

this will reverse the effects of scoring, so if the computer scores it will add to your goals (although you won't get the celebration)

let the computer win the first 2 matches by doing nothing, then on the 3rd match take the ball to the top of the screen, and see what colour the cheerleaders are / take a photo of it. (this part should be easy enough, you don't have to score a goal)

[Linked Image from mamedev.emulab.it]
is how it looks in MAME right now (you can tell it's the 3rd match from the display at the bottom)