That's what Andy did, yes. 
Personally, as it's fiddly to get at, and needs sealant on re fitting, I'd leave it be. Provided its clear.
Mine was blocked and as I didn't know what was in there or how it worked, I removed it to see what the problem was. On inspection it was clear, IMO, that all I needed to do was be more forcefull with a thin sharp implement to clear the blockage. There is nothing in there to break as you can see.
The purpose of adding to the original guide really, was to show people what's in there. Ie not much. Although Andyc had his full of gunk going by his guide in straight6 news.
Up to you obviously but it should be possible to clear any blockage and flush any crap through, then change the oil.
I suppose a scoop out of the larger breather hole will tell you how gooped up it is, then go from there...? 
Just thinking out loud here, relative to another thread, but as the early type gasket was replaced by sealant, what would be the symptoms of failing to seal the breather box correctly.
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Topic: Breather Box (Read 1906 times)