I see snow! 
I just noticed my car started lowering now that it is below freezing. Maybe I have a leak too that cold is exposing more, as well, air volume shrinks when it gets colder.
Best to test is remove the fuses associated with the suspension after you park it and see if the car is leveling itself to this low using the valves, etc. or if it is a leak.
Either ways, I wouldn't be worried about small leaks, especially if you do not notice the pump going on often.
good luck...
I just noticed my car started lowering now that it is below freezing. Maybe I have a leak too that cold is exposing more, as well, air volume shrinks when it gets colder.
Best to test is remove the fuses associated with the suspension after you park it and see if the car is leveling itself to this low using the valves, etc. or if it is a leak.
Either ways, I wouldn't be worried about small leaks, especially if you do not notice the pump going on often.
good luck...