Range rover sport 3.0 V6 2010 leaking gear box

Have purchased a 2010 range rover sport 2010 and noticed on one service last year it said transfer box is leaking and gearbox is leaking I have attached. Picture of service comments. I have said to the dealer will he fix and he said he will check and put right, is this likely to be a big job at worse case scenario.they have since had a service for over 1500 pounds with no mention of this being rectified when looking at the history .thanks in advance for any help or feedback

6 speed box is common for wiring sleeve to leak.

Is this something major to fix thanks

The ZF service kit comes with the sleeve and the new sump..

You have to drop the oil and the sump to release the retainer that holds the seal in place.