Car sits for 30 min left side drops, levels out when started and put in drive. on 2004 Mercedes-Benz SL500

The car will drow when it set for 30 min or more but when the engine is started and the car put in drive.

2 answers
poss leak in air bag or air lines, seek diag and est
air lift suspensenssion. possible leak on side effected. bring in to shop for pressure testing.