Wasn't all today, but starting Friday I changed fluid in the diffs and the transfer case. Both diffs and xfer case had remarkably clean fluid, which is nice to know my LR4 was ACTUALLY serviced. Now I have peace of mind knowing they definitely have fresh fluid in them (Valvoline Advanced Full Syn for the diffs, Royal Purple Synchromax for the xfer case).
I also decided to tackle the transmission pan swap, bridge seals, mechatronic sleeve, and fluid change this weekend as well. I had an opposite experience to most with the mechatronic sealing sleeve. Installing the new sleeve was a breeze, removing the old one took me about 4 hours of wiggling, prying, hammering, and nearly completely destroying the old one.
Also, there's a buried tip I found about removing the OE pan, don't saw it off, just give it a sharp shove towards the right side (passenger in the USA). Once you feel some tension when pushing to the passenger side, give it a good shove and the tube snaps right off. Took all of 10 seconds to get the pan out after unbolting it.
My additional piece of advice is to get some Kevlar sleeves and leather gloves from Harbor Freight for re-installing the transmission fill plug while it's running. No burns and I was able to actually tighten it down as needed. You still can't linger on the exhaust, but be mindful of bumping against it, re-position, and you're good to go.
Unfortunately for me the trans seems no different after the fluid exchange. I'll give it a few days to see if any of the negative behaviors change (clunky 2-1 downshift, some vibration/humming around 65mph). I have a Zip Kit in my back pocket (wasn't feeling brave enough to install this weekend) and plan on new solenoids for the next round of transmission fixes if it comes to that.
I did not reset adaptations, I am hoping 50-100 miles of gingerly driving improves the trans shifting behavior at least a little.