Volvo XC70 (2012) D3 FWD 120kw eDrive (6-speed manual gearbox) - does not display gear numbers correctly


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I have a Volvo XC70 (2012) D3 FWD 120kw eDrive (6-speed manual gearbox).
I bought it with a gearbox defect - something rattled.
My gearbox code is CGR9 7002 HB (1285037). I could not find a gearbox with this code.
Masters replaced with this CG9R 7002 JB (1285035).
Everything is fine, but when driving in 4th gear, it shows that it is 4th or usually that it is 5th gear, when driving in 5th gear, it shows that it is 6th gear. All other gears show correctly.
Where is the problem? Different gear ratio for these gears?
Can this be fixed without replacing the gearbox?
If it is still necessary to change a different gearbox, then what codes would be suitable for it?

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