One of the springs, either on the cable end or lever end, is where I'd look next. EDIT: The cable, part number 152 has a spring on the end; there is a spring on the lever end, number 147 and another, number 42 on the other lever as well. Something is loose there. Those numbers are from my manual, as I have the same exact model, and am interested in what you find out. Sent from my iPad using LMF