Help on MC component

I have this motor controller a friend gave me to repair, he is pretty sure it was water damage. It looks like only 3 components are affected 2 mosfets (have numbers on them ) and what looks like it could be a capacitor? This one has no numbers on it. The board has “C6W” printed next to it.

Does anyone know what it is?

 

Jeebus, he did a good job on it... "water damage" is a bit of an understatement.