2008 Rear Air Suspension sometimes sags

[6s219]

I have a 2008 Expedition. My problem is the rear will sag sometimes, however when I start the car and go in reverse or drive, it will start to pump its self back up. This is random, in other words it can maintain its normal height for a couple days and other time it will sag every day. Any suggestions? Thank You in advance for your reply.

 

[Mr Pham]

Slow leak in the airline, air bag or both.

 

[1997SCEBFEX]

concur on leak. is your check suspension light illuminated, or has it been?