mamba monster swolen capacitor

[suicideneil]

What brand are those lipos, and the C rating?

Swollen cap is usually a sign of ripple current caused by poor batts or maybe overheating- you could in theory replace the cap but it would be better to return the whole esc for testing & servicing- there is a form on the support page to fill out with return details:

http://www.castlecreations.com/support.html