Sometimes repairing pcbs can months even years whilst sometimes it can be done in minutes. Still if you ask for it back, i don't see why they shouldn't send it back no matter what the circumstances are. Dont forget to appreciate the fact that they tried to repair it. What was wrong with it anyway? The rom pcb shouldnt take very long to diagnose anyway, its the motherboard that can get a bit tricky. If you can confirm the rom pcb working, all you need is a compatible mobo to play it.
Dont forget jaleco system 1 pcbs have a security PLD device that is needed for any gane to boot. Think they have been dumped but not released publicly. Annoyingly there are different variation of motherboards too.
I take my hat off to you. I played it for 5 minutes and thought it was too brutal for my skills. Shelved it ever since.