No leak locked or unlocked. The vacuum tester holds pressure on all lines at the driver door main valve.

I wonder if it showing up when warm to hot and not when it is cold.

I guess I will have to give that a shot, next.

Thanks for the input.

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1980 300TD-T (82 Turbo and Trans) 159,000 Miles "Jackie-O"
1983 300SD 272,000 Miles "Aristotle"
1987 Jeep Wagoneer Limited - keeps the MB's off the ice and out of the snow
1994 BMW 530it