Have several warning messages on my 1998 E320 4 matic. "BAS", "ETS", messages on multi function indicator, and amber light ETS/BAS in lower left dash display. Cruise control stopped working at the same these came on. Read some threads about brake pedal switch and also wheel speed sensors causing these warnings. Anybody know where to look for these and how to replace? Could this be as simple as a blown fuse? I hope it's as easy fix, hoping to cut down the learning curve. Input anyone??