Dual EZ1290: volumes don't match!

Hey there all!

I just finished my first pair of 1290, and I want to thank madriaanse and you all for the great support I found on this forum. I'm having a wee issue: volumes on my two units don't match at all. They both sound great, but one has a significantly lower output  than the other.. My transistor voltages are fine. Any ideas where this could come from? I'm probably missing something really stupid here...

Cheers!!

My suggestion would be to check the resistor values for the stepped grayhill switch, perhaps something went wrong there, also check the zobel valuea for the cap and resistor on the output transformer, if those don't show anything, check the resistor values in the three amplifier sections!
Hope this helps!
Govinda