It's an engine driven hydraulic pump.
The photo focus sucks, but they do seem like *cough* very minor *cough* heat burns... which is really scary, I was hoping it was pilot overeagerness and not a potentially combustable situation onboard your aircraft.
OK, now THAT could generate enough heat through the hydraulic system to burn you while also not burning it (the pump or pressure-generating device) completely out.
See, and here most us thought you were just spending too many evenings at home, alone with too much time to spend infront of your computer, and then got stuck flying a later-model 210 with an auxiliary/independent electric hydraulic pump (power pack).

What's the production year/serial number on that specific 210, if you may happen to know, out of curiosity?