If it's a capacitor, then that goop that's all over your system board is an acid of some type and you should be VERY concerned.  I'm surprised it's still working, and would consider that server to be a ticking time bomb.  Replace the system board ASAP.  You'll be fine to migrate your CPUs, memory, etc. to the new board.  To reiterate, DON'T TRUST THAT BOARD!!  That acid is all over a printed wire and it should only be a matter of time before it eats through it and destroys that circuit.   There's a chance it will neutralize and stop eating through before then, but I wouldn't count on it.  To mitigate, if you don't have the option to replace, spray some non-conductive contact cleaner on it and try to wipe it up with a lint-free, static-free cloth.  Q-tips/cotton swabs are usually fine for this.
Good morning, I have just opened up our R910 for maintenance and have noticed that one of the components beneath the heatsink for CPU 3 has evidence of heat damage as well as a liquid that seems to have leaked onto the motherboard.  The server passes all diagnostic tests and seems to be performing OK.  Could anyone please help identify what this component is (we believe a diode) and what could have caused this damage please? Image attached: [IMAGE]
R910 Leaked/Burned component