What was found
SFO - FLT 422 - AFTER DEPARTURE FROM SJC, SMOKE APPEARED AT FWD EDGE OF GLARESHIELD BY CENTER WINDSHIELD. TURNED OFF WINDSHIELD HEAT AND SMOKE STOPPED. MAKE UNSCHEDULED LANDING AT SFO. CHECKED WINDSHIELD SENSORS AND TERMINALS, AND REPLACED WINDSHIELD HEAT CONTROLLER. CHECK-C 12-22-97 MCI. (M)