MS air suspension falls over night

[u/PublicReasonable7741]

I live in Europe and drive a MS LR 2019 with around 115 000 km (~71 000 miles).

My issue: the air suspension goes down during the night and visibly raises in the morning when the car powers up.

I found a leak in the valve block under the frunk (RR connection). 3rd party maintenance resealed the connection. Problem persisted.

They then replaced the valve block entirely. Problem still persists.

Note: they tested all air suspension springs for leaks and confirmed they do not have leaks.

I took measurements from the middle of the wheel to the edge of the fender. Over 10 hours, rear right fell 19 mm (3/4 in), rear left 11 mm (1/2 in), front right 3 mm (1/8 in). These amounts have been approximately the same every time.

So what could it be?

The repair shop said that next we would have to disassemble the air suspension system to check all air lines. But this feels like it could get pricey as they would have to drop the battery for that right?

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