A very common problem for the Lincolns. sounds like the body control module or the air pump, or a combination assembly of the two may have been trying to add air and couldn't because of a leak failure. It's usually one of the shocks that is leaking out the air. But sometimes it's a leak in the air supply line itself. It's almost never in the main or body control computers circuitry or wiring harness(s). feed voltage (activate, force on) the air supply and look (and listen) for air leaks. spray soapy water out of a squirt bottle if you have to. Once you've identified the air leak, replace that component. The body control (leveling) system should take back over at that point.
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