Poor connection or something else going on?

[KAS]

The pin connection is burnt a bit. Sign or of a loose connection or is that capacitor getting hot?

[forrie]

Pop the black pin out and have a look inside (and the pin) , should give you the answer

[TheIrishScion]

Sign or of a loose connection or is that capacitor getting hot?

Loose connector, capacitors don't get hot like that. Well, not for very long, and you can tell they did because of the exciting bang they make very soon after they start