What Is The Story With This Reverser?

I was scanning through some photos from my travels to Oregon with Mark and came across some photos of a United Airlines 737-700 landing at PDX.  It was braking and had the reversers deployed.  Looking at the shots, there is a dark burn mark on the engine nacelle that is split either side of the join in the reverser.  It looks like something has been cooked a little.  Anyone with experience that can suggest what has been going on with this engine?

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