Sometimes it's a crack developing in the line at the door hinge, I spliced mine with a rubber connector after opening up the rubber sleeve. But it's not that bad pulling off the door panel if you end up needing to, feel free to p.m. me if you want some tips, I've pulled mine plenty dealing with windows...
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So far...'76 240 D (sold)
'84 300SD (sold)
'85 300D (sold)
'83 300SD (p.o.s. waiting on tranny swap)
'82 300SD (could be the keeper)
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