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Zum Service Info Bulletin 120602 habe ich folgendes gefunden:

SUBJECT
Service Action to Replace Integrated Supply Module (IVM)

MODEL
E65/E66 (7 Series) with N62 produced up to 06/14/2002

SITUATION
The relay contacts in the integrated supply module (IVM) may be contaminated due to paraffin evaporation.
If an affected vehicle has a potentially defective IVM module installed, it may cause an intermittent "crank, no start" condition.

AFFECTED VEHICLES
This Service Action involves E65 and E66 vehicles with N62 engines which were produced from start of production up to June 14, 2002.

In order to determine if a specific vehicle is affected by this Service Action, it will be necessary to utilize the "Service Menu" of the DCS (Dealer Communication System). Based on the response of the system, either proceed with the corrective action or take no further action.

Es könnte bei Dir also durchaus an einem defekten, mit Paraffin überzogenem, IVM liegen. Auch wenn Du es schon überprüft und nachgelötet hast.