gearbox question and repair manual

[fiesta8u]

hey guys well as you are probably aware my lil fiesta had a little bit of a hard time and i had to change the gearbox, clutch and cv's, anyways besides the point, i filled up the gearbox with oil on the side plug but i realised there is a filler hole at the top of the gearbox where the hyd oil goes into the centric slave cylinder, whats that for? do i need to top up any kind of oil in there? as its a little whiney so im thinking maybe it needs oil in there but what kind? maybe its for the clutch bearing? also where could i get a repair manual for the mk6 fiesta facelift? i wouldnt mind having one laying around, please let me know asap, any help its greatly appreciated in advance, thanks.