Transmission advice please - tc80

[Free2drive!]

Hello, love our xc90! But I’m suspecting transmission work is impending.
Symptoms: Ocassional notchy shifts, hangs momentarily between shifts, often shifts down to a lower gear than normal between 3rd and 4th gear and 5th don to 4th.
All gears shift up and down whether hot or cold.
Mileage is 180,000.
Questions:
1 Will a valve body sort this out? If so how long for?
2 Would a full dump and refil help? Previous owner had transmission fluid dropped and refilled, invoice says only 3 litres supplied so I’m not convinced it was a proper job.
I’d rather change the valve body than waste money on fluids as the mileage is quite high.
It ran better for a couple of days after the adaptives were reset.
There’s a lot to read on the web but not much for higher mileage Xc’s. The v70 went 240,000 miles on the original box and seemed much better than the 6speeds.
Thanks in advance
Matt