What was found
EMERGENCY DECLARED. ON CLIMBOUT APPROX 20,000 FT CAPT'S AIRSPEED, ALT & VSI FAILED. CAPT SWITCHED TO ALT AIR DATA SWITCH, ALL CORRECTED AT APPROX 25,000 FT, BEGAN TO RECEIVE OVERSPEED WARNINGS (FAST/SLOW). AT 41,000 AUTOTHROTTLE COULD NOT MAINTAIN PROPER AIRSPEED. A/T WERE DISCONNECTED IN ATTEMPT TO SOLVE PROBLEM. TEN MIN LATER MACH TRIM & RUDDER RATIO & O/S WARNING WENT OFF. FIFTEEN MIN LATER CAPT PRIMARY ALT FAILED. *S/D* REMOVED AND REPLACED L/ADC & L ALT. OPS CHECK OK PER MM 34-12-01 & 34-13-01. FOUND WIRE W4471-0102-24 SHORTING TO GROUND INTERMITTENT CAUSING L/ADC TO GO INTO TEST MODE. REMOVED AND REPLACED WIRE PER WDM 34-12-12. L ADC OPS CHECKS NORMAL.