ned2683,

I would suspect the repair you performed. The superglue is relatively rigid and the tube in that area fails because it flexes whenever the door opens and closes. I would also be suspicious of the superglue bond to the tubing. Any separation of the bond and you would have another leak.

Try cutting the bad section out and splicing the two ends with one of the rubber connectors used in the rest of the system. Or, to test the area in question to see if it is leaking still, wrap it in electrical tape. Then go for the splice fix. The repaired area however would always be my first place to check, even after the splice, when you see evidence of a leak. Good luck, Jim

__________________
Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)