I have a 2004 E320 Wagon with 40K on it. My wife ( it's her car) thinks the SBC system is cycling more often that it was. The SBC pump is still under extended warranty. I called our local MB dealer and he said to bring it in for diagnosis. my question is: will they charge me for the diagnosis even though the SBC pump is still under warranty? I should have asked when I called but didn't think of it.