mudbunny Mayo - intermodulation problem

[Blues Healer]

Hello all!
I have a mudbunny Mayo, built per the parts list with no substitutions.
Everything is working OK, but I'm getting intermodulation, with some frequencies more pronounced. Also, for example, if I do a slide down a whole step on certain notes, it sounds 'sour'.
My voltages look like this:

      Q1:      Q2:      Q3:      Q4:

E -     0.02      0.04      0.02      1.18
B -    0.62      0.65      0.62      1.77
C -    3.86      4.32      3.60      4.83

I wanted to ask if anyone has run across this specific problem.
I've built a couple other mudbunnies without this problem, so it's buggin' me.

I'm reading some tech articles for ideas, and I plan to double check my parts, but in the meantime, I hope you can help me narrow down the area of concern.