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This is in a outside junction box on a shed is. I've had it plugged in all summer and a 20 amp long extension cord while I work on running electricity. We run asmall AC and power tools. I took the plate off today and the copper has some dark spots and some white green stuff on it. Wondering if it got what at some point? Otherwise what could be wrong with it?
 

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Naildriver
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Cupric oxide. Natural occurrence. The former coliseum that housed the Atlanta Hawks basketball team was called the Omni. Copper clad which turned naturally black. Never needed maintenancel.
 

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It could have been against a mounting screw or an uncoated spot on the box giving it a dissimilar metal reaction.
 

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Yeah, the water ingress isn't going to be good for that GFCI device either. Can you find an indoor location closer to the panel to put the GFCI? Then all this outlet needs is a sticker.
 
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