My thanks to everyone who took the time to evaluate my problem. I was just about ready to go after the combination switch unit on the steering column, thinking that's all that's left when I suddenly noticed the interior trunk light flashing on and off with the hazard lights. The problem has to be in back! Even though I thought everything was OK back there I removed the trunk liner again and upon further inspection noticed that bolt which grounds the tailight harness to the left rear fender, even though tight, was separated enough from the fender to allow the tailights to occasionally lose their ground. All I had to do was tighten the bolt further and all is well.
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