Hello, some news from yesterday : I was driving normally but after few kilometers, the direction started to pull on the right ... after a stop, a quick check and the front right had lowered... The height indicator inside was normal : in the intermediate position. I switched it to the high position without any problem : the truck raised and put itself in the right position. Then while driving, it automatically returned to the intermediate position.
So far, nothing to worry. But step by step… The front right lowered again : I did the manipulation again and came back home.
This morning, apparently no problem : the truck was still in the intermediate position. I thought it had a little problem with the sensor and I that it was fixed. But when I left, it starts to go down again ! : any ideas..?
Apparently, the air compressor works normally, and as the truck has not go down during the night, I didn’t think in a problem of leakage. Last point : the dash and the OBD doesn’t indicate any suspension fault.

the bags usually leak on the 'fold' of the rubber and that point changes dynamically as the car goes over bumps in the road.

however, when you park up overnight the hole in the bag might be in a position where the hole is not stretched enough to the point of leaking. 2010 VSE [Roger]

Thank you so much ! you were right : the truck had lowered this morning ... and a loud leaking noise was heard when I tried to help the compressor to raise it with the jack ... I just have to order a new suspension... and work some few hours ...: it had been two weeks since I didn't repair anything... I was starting to rust !!! Thanks again