What was found
ATB, EMERGENCY DECLARED, FAINT FUMES IN COCKPIT PRECEDING UNRELIABLE AIRSPEED L/H L 1 WINDSCREEN STARTED ARCING JUST PRIOR TO FUMES SMELL AND CONTINUED FOR APPROX 5 MINUTES WHILE IMC. REPLACED L1 WINDOW W/REF TO AMM 56-11-01 UP TO THE SECOND TORQUE,