We have had the problem at least once. I wasn't the one who found it but I think we removed the seats and some carpeting. The main reason I am replying is that the question has come up before and the point was found. I don't remember who it was but you may find it in the archives. He gave a good description.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician