Coda CSiB bias drifting

Hello!

I'm having a strange issue with a Coda Csib integrated amp. The bias either drifts drastically up or drastically down on one channel or the other. it seems to be only one channel at a time acting up and only after a while, at first they track pretty closely to one another until the amp is nice and warm. A lot of components seem to influence bias even when I just put my finger on and without a schematic it's really hard to track down. Does anyone have any info on this issue on this particular model or have a schematic ?
I did get an answer from coda on what bias setting to aim for but no help with the actual issue or schematic.

Hope someone out there can help me get the strange out of this one 🙂