Xpantastic!

I've had my Xpander for a few years now, and when I first got it it 
worked fine. Now, however, the only test it passes is the VCO test. 
All the other tests fail. I opened it up but I didn't see any bulging 
or leaking capacitors or any other obvious damage. I made sure all 
the accessible cables were firmly plugged in, and to my non-expert 
eye it actually looked pretty clean. Is there anything I should look 
at, or should I start looking for repair techs (or should I be 
looking for a new Xpander)?


         Seth