Vintage Synth Repair

I could use some suggestions to repair my Wurlitzer Model 4373. I 
inherited it from my Uncle recently. It appears that it had not been 
played in quite a while, as a lot of the keys made no sound and there 
was a lot of static in the switches. I cleaned all the contacts which 
restored all the keys and eliminated the static, but the pedals do not 
work right.
Going UP the scale, I press the pedals:
   C D E F G A B C
The sounds, however, come out
   C D E E G G B C
When I play the pedals DOWN scale, neither the E nor the G play any 
sound...I must go back up the scale to get the sound (albeit the wrong 
notes)
I cleaned the contacts, made sure there were no obvious shorts or 
crushed wiring, but no luck.
Anyone have any suggestions?
Thanks for reading this far...
Bob