Am also searching through the workshop manual for the gearbox heat exchanger cooling side , just trying to cover all bases so to speak

As there’s the flat plate gearbox cooler with the 2 x pipes for the atf oil side and other 2 x pipes from the engines water cooling side

Will come back to u if I find out any further details for u mate , ie, if the overheat temps are in the workshop manual etc so then at least we will know what the trigger points are so then could look via the live data on the scanner

Blimey these workshop manuals have a lot of pages

Just had it in the back of my mind if there was anything else that could also cause issues and started to look on the cooling side of the ATF heat exchanger and came across these , alas haven’t confirmed as of yet if u have one fitted to ur model

Don’t know if ur able to see any of these items as of yet plse , particularly if things are in the way

IE

The Automatic Transmission Fluid (ATF) warming valve is a thermostatic ATF mixing valve. The valve is designed to reduce the ATF warm up time and provides a precise temperature control for the ATF temperature. The ATF warming valve mixes the hot engine coolant from the thermostatic control valve and the cold engine coolant from
the radiator low temperature zone. This provides the desired temperature control of the ATF temperature.


Hope it’s useful mate and expect I’m totally barking up the wrong tree but wished to try and read up as much as I could of the workshop manual in case there was something else

Plus looking at some pictures I think that round transmission electrical connector may twist off instead of directly being pulled off , I will of course try and see if that’s the case or not mate

Hope this may also be useful to u mate

Ref that picture of temperatures , do u have the left hand side of the picture to show what sensors there reading plse

As maybe there from an ATF warming valve

Many thks and when u get chance if you would be so kind to have a look if there’s one fitted by ur engine plse , thk u