Quote from “the kick inside”

I believe if you pull the transmission computer (battery disconnected) you can then drive the car using the stick as a manual shifter...but don’t take my word on that...

Not heard of this idea before, I will try it and see what happens, not sure how it will be possible to manually shift up through all of the gears when there is only D, 3 & L to choose from. I will try starting in L and shift to 3. But I will never get into 4th.
Maybe this works better on other makes with a 3 speed box and shift positions 1, 2, & 3 to choose from?

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If I were you I would do the gear selector switch and the flush and see. Your probably going to have to do the selector at some point anyway.

Yes, I think this will be my next move.

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Also has anyone connected an analysis unit to the instrument cluster, or a pressure gauge to the transmission itself? - Both recommended test procedures from Volvo I believe

Not sure what the bloke connected up or tested, as I could not be there at the time. When I left the car he told me that he would be able to “test drive” the transmission using his workshop computer, thus eliminating my on board ECU. He later reported that there was no fault found with the electrical components of the system, but I don’t know exactly how he arrived at this, or if he tested each and every electrical component separately.
His conclusion was mechanical failure, when I questioned the torque converter? he said that was unlikely, the failure was most probably the clutch. He made no mention of testing the pressure.

I will keep you posted.
850 transmission problem…… to be continued…….