Alesis Andromeda A6

Greetings,

I've had my A6 Andromeda for about a month (bought used).  Here is 
what I notice:

OSC 1 voice 2 seems to be shot, but I am not sure.

Here is how I am testing it:

Bypass filters, turn off effects and mods.

Set all volumes to zero except MASTER (full), OSC1 pre-mix 50%, and 
LEVEL (full).

select any waveform.  

Voice 2 in the voice monitor sounds like a semi-broken saw 
regardless of the OSC wave I select whenever it is keyed.

It sounds in "pitch", but it isn't a sin, or tri, or sqr.  It sounds 
like a saw.  closer to negative saw.

If I turn all voices except 1 and 2 off and set poly voice selection 
to random, voice 1 sounds great.  voice 2 sounds (first with a loud 
filter click!), then it plays that broken saw.

If I don't select a wave for OSC1, no "broken saw" sounds.  However, 
when I turn the pre-filter mix on OSC2 up to 50%, the "broken saw" 
bleeds into the voice in OSC 2.

The "broken saw" does seem to change waveshapes when I select a 
different wave, it simply doesn't sound anything like the other 15 
voices.

Any ideas what component failure could cause something like this?  
Do this sound like a bad oscillator?

Any help is appreciated.

Thanks,
hs