Hi guys.
I'm doing my breathers and have a blocked pipe. Its the smallest one, no. 3 as seen in the pic below:

I've stuck a long wire down the whole length of the pipe but it seems to be the bottom bit where it comes out of the middle that's blocked.
I took this picture from the maintenance guide and cant work out exactly where the exit point for this pipe (purple line) is. If I know that, maybe I can unblock it.
I've prodded around as much as I can with a thin bag tie wire but am not certain where to poke?
Can anyone offer advice on clearing this please?
Cheers
Neil