Hi all,
Haven't been on in a while (hence the shout out post, good to see you all

) but it seems you have your hands full.
This machine has multiple issues. Might I suggest tackling each separately:
Seems the monitor is going into shut down mode. Generally this happens when something is dead on the chassis, not indicative of a bad tube. You would not get any image on the screen if the tube was bad. With that said you need to source out the type of monitor you have, most likely a Motorola and the manuals are online for that.
Second, most of these early clones were still running 120 volts AC AT the board. You referred to it as a service board, lets call it a PCB as that is more common. The PCB requires 5V DC for this to run properly. Basically the ENTIRE voltage regulation section on that board can be bypassed and a standard power supply could be run in place. In other words, get around the known failure points on these older bronze age classics.
Finally you have the condition issue. Appears to be moisture damage, which in my experience also means chip damage on the legs of the PCB socketed chips. If you are lucky enough to remove, clean each leg and resocket each chip on the board (which is where I would start) you still have the cabinet condition to concern yourself with. Bondo and some elbow grease will polish up the frame nicely then a coat of good ole black spraypaint makes' er purty.
Given what you have in the game, what do you want to spend on it? Even if you find the books on it and can do the work yourself, consider the costs....monitor parts, lets say 50 in parts to replace the bad bits and maybe 4-5 hours spent on the workbench sourcing the problem. Assuming you can borrow something like a Variac (helpful to run the monitor from 100 Volts instead of 120 and keeping it from shutting down!) you can do most of the work. Then the PCB power supply, assuming you install one, would be 25-30. Then the time to wire it all in. Finally the cabinet work.
I'm not looking to rain on your parade, but just realize it's not a super valuable game if it is working. I would say in MINT shape you've got a 350-400 buck piece. That is if she's working all the way. Now, if you had an Atari barrel-cocktail with a low serial number, then you get crackin....
One option might be to gut it and replace the monitor with a standard black and white old-school thrift TV and the PCB with a four player pong machine off of ebay. Nobody would know the difference and it would work forever. Now that cost of repair and time drops off substantially. You could do that all for under 40 bucks!
Just my .25. If you take some pics of the board up where it plugs in I think I can see if it has 120 on board. Those are line voltages mind you, NOT isolated, not filtered. Its like sticking your finger in the electrical socket. Be careful man, they did away with that by the later machines....
Cassidy