I just wanted to update this thread for completeness. I have been really busy moving but have been meaning to update this thread.
STAX finished the repair of my SR-009s in about 3 weeks. They said that there wasn't any problem over the phone (I can't read the repair paperwork as it is all in Japanese) but they did burn in the SR-009s for 2 weeks straight.
I am not experiencing any channel imbalance problem through the same setup nor through a SRD-7 PRO energizer. The serial number is the same.
I am sure that when I sent them in that I was a channel imbalance but unfortunately I did not get a chance for anyone else to help me verify. They sound absolutely perfect now with no signs of imbalance or decreased response in either channel. When I got them back I burned them in for another 40+ hours or so continuously.
One of the benefits I had is that they sealed everything back in their packaging that I sent and it was like opening a brand new pair. Anyone that has unboxed a pair of these knows the obsessive attention to detail that is spent on even the most minute details of the packaging.
I did not mean to cause panic and I hope that nobody else experiences this issue in the future.