You should remove the other capacitors and clean the board immediately to prevent further damage.

Unfortunately such is the state of many, many SE/30s in the wild.

The capacitor in question is a certain C13, which is a power decoupler for the +5V supply feed. It is quite important, and there are a few other 47µF capacitors that filter the power from Pin 12 of Port J12.

See the first link in my signature for more.