Plug in wing-root vent?

[Red Air Rambo]

Talked to a different A & P today that has a 210 with similar holes, He said they go to avionics or equipment for cooling. He thinks the plug is the result of removal of a piece of equipment so the cooling was no longer necessary.

[CaptainRod]

That's very helpful. Thanks very much for the info. I called Cessna yesterday and they were not much help at all. Nobody there was familiar with the 337. Sad.