I don't believe there is any other fitting that needs to be opened to sucessfully bleed the brakes. I have had some especially spongy pedals that required some serious bleed down to get right though.

I was always under the impression the best way to really bleed the system was to actuate the high pressure return pump through the activations screen under ESP/BAS on the DAS machine. Perhaps Gilly (the man) has further insight into this?