I'm new to this forum and new to the BMW world. I purchased about 3 weeks ago a 2004 4.8is. The car is immaculate and has 105k. I recently changed the valve seals and rear upper control arms. This morning I woke up and the truck is leaning on the passengers side. When I turn it on it did not raise itself and I had to click the button and then it leveled itself out. I went to my BMW mechanic and he said the bag has a leak.

any advice. The mechanic is charging 998.43 for each air bag and strut. I find that be very expensive. Any recommendations. I've read arnott is a good replacement.