As far as maintenance gos, you might need to change the oil once in a while and adjust the timing belt from time to time.
As far as the best place to keep PCB's... my house. Send them to me and I'll store them for you free of charge.
Alright, seriously, not much maintenance needed depending upon the condition of the cab you buy. I've had my candies for about two years now and other than an occasional dusting and some windex, haven't had any issues. They were both in fantastic condition when I got them though. I have a cab I bought from an arcade and it needed some cleaning and dusting, but haven't had any issues with it either. There are many people on this forum who can help with any technical issues you develop with your cab, but you should know the basics and read up on wiring and electricity and such. Definitely don't stick your finger in the monitor's anode.
I store my PCB's in flat boxes I bought from Uline. I use pink antistatic foam to cushion them and make labels to make them easy to find in my closet.
Hope this helps or at least gave you a good laugh. Check the tech forum for the most common issues with Arcade Cabs. Power supply, Monitor cap kit, replacing joysticks, buttons and microswitches, etc... but if you buy a cab in good condition you shouldn't have a problem. It's probably a good idea to locate a good arcade tech in your area too.
