The board with the white wires is the left channel power board. The black wires in Avionic's picture go the right channel power board. The boards are identical...not mirror images. The red and blue power wires do not land on the same traces. Left channel is different from right channel regarding where the power wires attach. My pictures all have the left channel showing. Thanks Hyperion. I wouldn't have noticed this difference if you hadn't said something. I'm not planning on working on my B-2101 any time soon.