Vintage Synth Repair

Hi, Scott! 

I opened the Wavestation. Surprise... the high humming noise is 
coming from the Power supply. Thats for sure.

At 5 or 6 components of the PSU there is a brown stuff, hardened, 
between the components.

Most of all between L1 - L4. Looks like some sort of hardened brown 
chewing gum filling the gaps between some of the components.

Everything except for the display backlight is working fine.

So, what to do now? 

Change the Power supply? How can I find out, if the display is 
working, but the Power supply has a problem? Anybody got a spare PSU?

Really sad, because the Wavestation is in mint condition from the 
outside, even the keys are OK so far.
I am living in Germany.

Best regards,

Ambrosia