Well... I cured mine (from fluctuating) by cleaning ETM.
Same engine, but 170bhp and on V70.
I know my answer doesn't help much, but at least you know someone reads and thinks..
I would use it as a opportunity to get rid of spare ETM, which I bought unnecessarily, but I don't think you need it..
Maybe someone, someday will.
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`03 V70 Mk2 Auto 2.4 B5244 NA, 170Bhp, 295K miles
(Now parts donor)
'05 XC70 MK2 Geartronic, 2.5 B5254T2, 210bhp, 129k miles
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