Definitely grab copies of the manuals for your games.
All of the resources that I am aware of (now including Antelope Arcade -- tks PL1

) are listed in the wiki:
http://wiki.arcadecontrols.com/wiki/Restoration#Game_Manuals.2C_Schematics- I believe boardjunkie is correct about the attract sounds on MsPac.
- Yes, the marquee on MsPac is supposed to light up -- remove the marquee retainer and have a look. IIRC, MsPac was a basic florescent fixture and is usually easy to fix with either a new bulb or a new starter.
- I think that most of the settings for A51 can be access from the test menu (accessed using the test swtich, usually located just behind the coin door).
- Please post of pic of the "white lines" in A51 -- sounds like the brightness is too high.