Thanks for the all the responses. While I am certain that I am losing some air as the level drops some overnight, the issue that I do not understand is why the pump does not turn on in the morning after losing the air? (I hear a click, but I don't hear the compressor turn on) I have to do use the height control switch to get in back to proper level, and the compressor works fine at that point. I have recently replaced the height control sensors, so that should not be the issue unless I got a defective batch and there are no codes stored (using the manual approach with the jumper wire). Any more ideas?

I think I figured out the problem on why the suspension was no longer releasing air (or raising up with load). When I replaced the height sensors, I think I may have bent the tabs where the sensors connect (the metal of the tabs is fairly thin). I crawled under the vehicle and noticed that the tabs did not appear to come out at a 90 degree angle from the bar that it attaches to. I used a small square and bent the tabs back to what appears to be 90 degrees. When I finished, the vehicle started self leveling again and rides much better. I learned in another post that if the sensors are not calibrated properly the leveling function is disabled. In my case, while I reinstalled the sensors at the same position on the tabs, I apparently bent the tabs causing the issues I mentioned. I still think I do not have them calibrated exactly correct, but LEXUS dealer is 2 hours away and I don't think the local TOYOTA dealership will have the experience to do it properly so I am going to keep as is for now. Thanks for everyone's responses!