Did you replace it with the old style white/clear or the new black? The old ones are notorius for leaking.

If you get stumped and we can't help you (I bet the forum helps you figure it out) I would take it to a different mechanic. Electrical IPs wear a lot more rapidly than our mechanical ones. Replace the IP is a common step most mechanics do...problem is on our cars, the IPs will most likley outlast the engine.

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2009 ML320 Bluetec
1985 300CD
1981 300TD

Past Mercedes
1979 300TD
1982 300TD
2000 E320 4Matic Wagon
1998 E430
1984 300SD
1980 300SD