D3 Gearboxes are pretty robust but at 140k, an ATF change would be a good move even if you didn't have any issues.
Most important thing here is to make sure you don't give the job to someone that doesn't know what they are doing....
I'm not in the UK but I have used an Audi Dealer to carry out ATF + Filter changes 3 times on my old D3 over the years. They dropped the pan, replaced filter etc. but I think it cost about €500 everytime. The fluid is expensive.
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