10 hour burn on new lamp = Success!
My second hand Epson 8350's original lamp made it to just over 2200 hours before failure. I managed to find a local source for the Epson OEM lamp at $249! Very shortly after returning from the ~hour round trip to get it, installing it and being astonished by the split screen; I found this thread. No doubt, I was furious at first that the lamp seemed to be F'd, then realized there was just no way it would cause this and went looking for answers.
After reading this thread, I decided to let some HD programming run all night. After probably 10 hours the line is gone and there is no trace of any issue with the picture. It is what it should be. Epson should acknowledge this or fix the issue with their code. It's obvious that the new lamp is shocking something in the PJ's circuitry to cause this anomaly on screen after lamp replacement.