Xpantastic!

My Xpander was working fine (I bought it new in the late 80's).
I decided to put in a new battery (I was in the process of 
changing the batteries on a bunch of my gear) and did so.
The operation seemed to be a success since I was able to load the
factory patches and they stay in memory over a power cycle.
The problem is that the VCO tests/tunings all fail (every other test
passes). 
All the VCOs are way out of tune or almost silent. Any suggestions
would be greatly appreciated. I have gone through the reset sequence
with no luck.

Thanks,