Wiring Diagram help

Can anybody help me with a wiring diagram(s) from a Superb, specifically one that details anything in and out of the diagnostic port (preferably something published by VAG as opposed to Haynes)

I took up the opportunity of a free STS with the recent Shark Performance Group Buy and popped in to see Ben, when in the area, to collect my STS. Despite being busy he was kind enough to offer to load up my new map there and then and that's where the fun and games began.

Long story short, Ben had a nightmare of a job getting the STS and his hardware to communicate properly with the ECU through the diagnostic port (would read but not write properly and at the time Ben suspected there may be a power issue as the STS box backlight flickered - my battery is new and we even hooked it up to his charger). In the end Ben removed the ECU and managed to flash it directly. Ben has mapped Superbs in the past and not come across this issue before.

Doing it this way makes the STS redundant, which defeats the object of having it. I'm now wondering if there is something amiss with the wiring between the port and the ECU or power to the diagnostic port and was hoping to get a wiring diagram so I can do some checks.

Any help would be appreciated