Vintage Synth Repair

As my DW8000 is sidelined, I figured I'd fire up the ARP Omni Mk1 I 
bought on eBay for $95, some repair necesary.

Well, here's what's wrong so far.  First, I don't notice any 
difference at all with the Voice buttons on the right.  The Bass 
keys...most of them Do Not Work.  The polysynth string section seems 
to be ok except for dead top note, but the bass keys have all kinds 
of problems.  Some work, some interrupt a working note, some do 
nothing, and one or two of them actually modulate a working note.  
Bottom C has gone vibrato, no notes sound through low G, wich is the 
one that cross-modulates other notes, low F is the first note with no 
sound that will cut out a higher working bass key...etc... the Attack 
and Release sliders on string section do Nothing...LFO Speed slider 
is REAL touchy, all the range of it seems to be on the very rightmost 
of the slider, Master Volume switch, in addition to being snapped off 
flush with the panel, also does nothing.  Chorus Phaser also does 
nothing.  Also, half the slider caps on the top row are gone along 
with the caps for the Cello and 8' buttons.  Also, buttons tend to 
stick.

On the plus side...none of the keys are cracked off as is common on 
old ARP's...  

So, did I get soaked for $95?  ($70 + $25 ship?)

What must I do?

Tim Hansen