Vintage Synth Repair

hi there!

i´ve got a rev3 in great cosmetical shape. i keep it in a studio and
i´ve never taken it on a gig... one day it broke down and now it only 
makes funny noises when i play. just noise and weird modulated stuff!
has anyone out there got an idea of what can be going on!!?!? is
there anythig i can try before i get i serviced!?!?!??? also when
it´s functioning "normaly" the led flashes a little bit when i turn
the knobs and the filtersweeps sounds a bit stepped when i use the
button!!! is that normal?!??

cheers! and thanks!

Daniel