When I had my D4 I did the upgrade myself. The parts cost was less than the fuel cost for at least 2 trips to the dealer, the first for them to confirm that the smoke existed, which it would not have by the time I travelled to the dealer, then another trip to have it fitted, assuming the dealer confirmed the problem and that LR approved the fix under warranty. It wasn't a quick job and I didn't appreciate getting my eyes full of dirt but I didn't have to argue and it took about the same time for a 1-way trip to the dealer.
MY21.5 L405 D350 Vogue SE with 19s. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
VK2HFG and APRS W1 digi, RTK base station using LoRa
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