A brief search on google didn't help much, but in order to appease my curiosity of what I witnessed, I'll turn to the experts here on APC....

Last night I witnessed a 737 taxiing out from the ramp with a very visible red glow from the turbine exhaust nozzle on the #2 engine. I've never witnessed that before or heard of it occurring.

I made a mental note of the tail number and flight number in the rare chance that I witnessed something dangerous, but by now its clear that there was nothing wrong.

My assumption is that something in the engine was at a much higher temperature than would be typical and was glowing red hot. Anybody have an explanation for what I witnessed?