Update from my Haldex oil change today, all went well but I struggled with the following steps:
a) The two Torx screws keeping the Haldex ECU in place, the bottom one is very close to the drive shaft flange and all my tool combinations were either too short or too wide to clear it, not any set will work there, you've been warned! I was saved by a really thin wrench I had in my tool case which i managed to squeeze between the screw head and the flange at an angle, get the hex bit in and clear a valuabe 1-2mm to operate it. However this proved to be a wasted effort as...
b) The ECU plug connecting the Haldex ECU to the pump, yes those dreaded locking tab connectors VAG uses that if were designed with 40% less stiffness on the tab, they would be just as slip-safe but possible to remove from all those pesky, limited-access locations with just one hand instead of endless pulling, swearing and finger crushing in vain... I thought I had got the hang of them after so many JB4 installations and its infamous plug D but it just wasn't my day so, if you find yourself in the same position, you can proceed without disconnecting the pump from the ECU at all. Here's how this slightly alternative approach works:
You still unscrew the ECU (remember it takes a special extension or very thin wrench to achieve that) to make more slack for the wiring.
You unscrew the pump but obviously don't stretch it now as it's still connected to the ECU, instead you need to be keeping it up. In some videos they suggest leaving it to rest on the exhaust pipe next to it but I didn't want to take my chances and as I had a buddy with me (always a good idea for jobs you've not tackled before) he took over "support duties".
You can then work as per the usual instructions while having the pump up.
c) One last thing, the M10 filler screw... I have a few tool sets and combinations with which I've completed several jobs in the past, however all my HEX bit sets were stopping at 8, i had actually never needed a 10 HEX bit so far... Why on earth this is not a HEX head bolt but a socket head only VW knows.
Of-fcourse I had a good old Allen key set that could do the trick as it included a size 10 key, but not possible to mount on a torque wrench to apply precisely the 38Nm specified upon re-assembly. So, I just relied on common sense to tighten the new bolt back with the Allen key, if you want to do it right make sure you have a 10mm bit before setting off.
And now time for the star of the show...
I had seen people cleaning their Haldex screens at 20-30K and they were looking only mildly dirty so i had some doubts how dirty mine would be / how necessary the whole operation after 2 years and 22.000 km.
Yes I have done at least 20+ launches with the car, and it's tuned too but I was still shocked from this sight upon pump removal:
The screen was in that sorry state at all sides, not just the one seen in the photos There had recently been the occasional trumping during launching, but only then, not in normal driving so I had suspected it could be slightly clogged, not that horribly though.
After I saw this I can only say I'm glad I did it and it will be added in my list of yearly or 18months max maintenance, it's going to be much simpler and quicker next time I reckon.
Again thanks to Bap for this guide that detailed the process and provided a great basis to work on