ZS180 noisy gearbox

ZS180 noisy gearbox

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Hi, this is my first post prompted by the purchase of a mk1 ZS180. I've just got this car but am not new to ZS's as this is my fourth 180.
It's done just 57k and has a documented FSH but on the drive home a gearbox noise became apparent. I noticed it on the test drive but one I had before made a similar noise and didn't take it on the motorway and should have! Daft mistake to make I know....
The noise becomes apparent at above about 30 where it's only noticeable when on the over-run, i.e. keeping constant speed. It gets louder with speed and at a constant 50 (on the M1 roadworks) it's annoyingly loud. Under hard acceleration its less noticeable and at 70+. So it appears at about 30 and gets louder with speed, not revs. It disappears when I back off the throttle and disappears when the clutch is depressed. There is no noise below 30 or when stationary (does this ruke out input bearing) and it doesnt change with electrics on (ruling out alternator bearings).
I haven't checked oil level yet but will despite the full SH.
One clue might be that CV joints were replaced a couple of years back - wrong oil put in?
So, any idea's what's making the noise?
I'm disapointed after my return to ZS's now that kids are mostly out of car seats
Any help greatly appreciated!!

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ZS180 noisy gearbox