If you look at ~6:37 or so at the video of the engines it looks like they have a low pressure fire/leak lapping at the outside of the engine. Presumably that is

If you look at ~6:37 or so at the video of the engines it looks like they have a low pressure fire/leak lapping at the outside of the engine. Presumably that is not a good idea since they are running sensors/electronics there? Anyone guess whats going on?