VA6 Genesis wrong power polarity repair.

[junkyardw]

I received a lot of non-working genesis yesterday. Two of them were easy fixes but one appears to have had the wrong kind of power supply plugged into it. One voltage regulator was bad, a couple of caps were blown, and one of the surface mount components on the bottom was burned off. I replaced both 7805 regulators, but im not sure what the component on the bottom actually is, it is labled C2, which makes me think its a capacitor. It is located right next to the voltage regulator pins, but has no numbers on it. Can anybody tell me what it is? And if that is a capacitor can i replace it with an electrolytic kind? I will include some pictures.

Thanks