i bought mine from the jag dealer, the whole lifting mech each time .And the new ones are still working fine .I suspect a manufacturing fault .
Other problems i've had are :-intercooler manifold split on its off side ,new one has been re-designed with different joint on near side .
Fuel level gauge reading zero .I fix this by swiping a strong magnet across the diesel sender unit inside the fuel tank .
still got to fix the seat heaters ,Matbe during the lockdown
good luck with your repair and be careful with the screwdriver
stay safe