Spot on! The 18 blinks do last exactly 20 seconds. I have read before about vacuuming the sensors but that did not make much sense to me since being in the electronics business I could see that vacuuming would not get to the dust. I am baseing this on the dust buildup observed in the sensors I got from the junkyard.
Anyway, removing the covers and giving each sensor a quick shot from my CO2 blaster solved the problem. No more blinky!
I will see if this solves the behavior problems, at least I am on the way to figuring what is going on. Thanks.
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