FWIW, I changed my transmission fluid to AmsOIL Synthetic (their WS rated fluid) as part of my baseline when I bought my LC. 100,000 miles later and I haven't had any issues with it. I'd also recommend against having the transmission power flushed for the reasons stated in earlier posts (chance for contamination with non WS fluid and flushing crap up into your valving most especially).
I used Bamachem's method located here: https://forum.ih8mud.com/threads/picking-up-an-07-uzj-on-monday.461883/page-6#post-6465209 and that seemed to get most of the old fluid out.
I used Bamachem's method located here: https://forum.ih8mud.com/threads/picking-up-an-07-uzj-on-monday.461883/page-6#post-6465209 and that seemed to get most of the old fluid out.