Glad you sorted this out
Im going to recondition entire rear diff
Problem is Toyota does not allow to repair ELECTRO MAGNETIC CONTROL element therefore does not display parts for it
I've managed to reverse engineer and from Japanese forums
All parts in total will cost me 250GBP imported this will rebuilt and replace all necessary elements total 15 to make rear diff as new
cannot wait -- it is like lego so easy to drop it and remove from car and all work done on bench
Yes the main front fails often and nobody is talking about it in UK -- but in Japan this is on the most common list to do.
I hope you change side seals same time if not please monitor if you see any sweating dont wait
normally OEM 90311-42046 and after 2014-on: 90311-42062
But im sure you know how to find correct part numbers
All the best