Opinions, opinions.

I found this 86D. It looks to have an RPM problem I think.
Tried to give the best photos I could.

 

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Sure looks like one, but could also be a plating bubble in just the right/wrong position, don't you think?

 

It has the right placement for RPM-012. But has that lower bump at the bottom of the curve.

 

Could be a bit of zinc rot
That's the spot it usually starts.

 

It's definitely not Zinc rot.

 

Took another look and going to try to show another photo there is some split plating in the area. Zero corrosion or rot.
Give me a minute or two.

 

Definitely no rot and still a shiny zinc in tone