Problem solved - hopefully
I took my Jeep Trailhawk to another branch of the company that installed the system yesterday. This location had a tech who had installed many systems. He said all looked fine initially, but when he pulled apart each connection he found that the previous tech had used teflon tape around each of the plastic fittings for the check valves and for the vacuum connection to the AFO unit. He said that is not to be done and could cause a vacuum leak. Evidently the plastic valves and connectors are designed to bite into the vacuum hose rubber and to create a good seal. The teflon tape prevents this. He also found that the AFO brake piston was installed so that it was continually partially depressing the brake pedal. The tech removed all of the teflon tape, reconnected everything and also put zip ties around the vacuum hoses at each connection point. He also readjusted the AFO brake piston attached to the brake pedal which evidently was lightly applying the brakes and affecting performance. So far, I have not had any more ESC off errors messages.
I had also talked to the Demco tech rep who said this type of error is almost always related to a vacuum leak issue. The initial install tech had failed to add the check valve closest to the AFO unit and this caused the ESC off message to appear immediately. On the second visit they corrected this, but then the intermittent error message started.
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