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2002-2005 Range Rover MkIII / L322
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lowering every time puts a lot of unnecessary stress on the compressor. When you think about lowering vents air out of the four bladders. When you raise back up you use all the air in the reservoir. this in turn requires the compress to top off all four bladders and fill the reservoir.

Moving your post and this response as it is off topic.
Fix the leak but if you want to lower it every time you park it that really shouldn't be an issue. The compressor goes bad from being overworked trying to compensate for leaks and running continuously to a point it overheats. Under normal operation refilling the reservoir after a suspension command won't damage it. My rig is almost a decade old, I lower it every time I pull into the garage. No sign of the compressor giving up anytime soon. Worst case you just rebuild/replace. Personally I think using the suspension often keeps it in good working order.

As for the leak raise it up and spray soapy water on the bellows, look for bubbles. If you can't find any raise it up and listen for leaks at the hoses/valve block. Also when you experienced it deflated was it really cold out that night? That can also cause issues occasionally where valves end up freezing resulting in the car sinking.
I tend to agree with brad s1, I lower mine to access mode everytime so far so good, Yes you use the compressor more, but it should be within its realm of capability.

I like to think whilst the car is sitting for a while in access mode there is less pressure/stress on the air bags.

Thats how my mind works anyway, and I'm aware the systems Land Rover design however clever don't always work like they are supposed to.
 
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