gearbox breather !!

Hi , just topped up my gearbox oil and now appears to have a leak !! could anyone tell me if theres a breather on the pg1 manual box and its location ? when i topped it up it took more than 1/2 a litre !! wasnt leaking until i topped it up !! done a search but couldnt find anything !!
thanks
Alan

wheres it leaking ,i think sorting that unless greatly over filled is your issue

looks like its leaking from the back of the box ! its not overfilled , after topping up it was left to drain level with the filler plug ! was thinking , if theres a breather , it might of become detached from the box . causing the leak .ie oil getting splashed about and coming out of the breather !

well i'v found out where my g/box is leaking from , its leaking from the selector shaft oil seal !! just got to source on of these and a rubber boot / bellows and its sorted again !!