OK. Found a major source of the problem. The green line had cracked in the driver's door/hinge rubber boot about 4 or 5 years ago. I had fixed it by cutting it in two and adding a rubber hose to join the two sections together. That short section of rubber hose broke in two. I'm surprised. I thought the flexible rubber would last longer than that. It failed last winter so I think the cold weather must have contributed to its failure.
It's a ***** working with a broken line inside that rubber boot. I'm going to see if I can remove the short broken piece of rubber from the inboard end and reattach it to the remaining rubber hose still attached to the outboard line.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13