Transformer at MS-10

[RoBot]

I recently bought a Korg MS-10 at a flea-market for about $60 ;)
It's in perfect condition, except from that I think that someone have fried
the 110V transformer with 220V "European power" and some other components.
Now my question for all MS-owners:
At Hyperreals MS-20 schematics there's 18V with regulators for +15V/-15V.
How many volts is the original transformer at?
Could it run with a 15V 400mA transformer?
I have a transformer without the 0v common ground connection, so I'm
planning to make one with resistors (tip from a friend), but I don't know
how many mA's the main board needs.. Any tips?

I've checked the net for some basics in AC/DC converting, but without any
useful results, and my electronic skills are limited to simple ttl, so
maybe you can help..

Thanks, 
Martin