Gearbox is on side of engine below air filter.
The oil should be changed at 40k miles - I did mine then. The differentials whine.
You should get the level checked: remove the engine tray jobbie. That is job number one.
Drain and refill oil, job number 2.
If still noisy, remove gearbox as it's a bearing - likely. No change from £500 in my view and possibly more.
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