What was found
AFTER TAKEOFF, LOST MULTIPLE AVIONICS, PILOTS ALTITUDE, AIRSPEED, RADIO ALTIMETER, AUTOTHROTTLES. FIRST OFFICER`S FLT DISPLAY WAS SIMILAR BUT REGAINED AIRSPEED, ALTITUDE, BUT NO AUTOTHROTTLES. LAST FLIGHT FAULTED ADC SYS L WITH FAULT CODES 110401, AND 130401. ALSO A SECOND EVENT ON SAME FLIGHT LEG WITH FAULT ADC SYS L AND CODES 312251, 210401, AND 220401. TROUBLESHOT IAW FIM 22-02 FAULT TREE 829 AND REPLACED LEFT ADC IAW AMM 34-12-01-4, DUE TO TRIPPED FAULT BALL. ADC RTS CHECKED GOOD. FAULT WOULD APPEAR TO BE ISOLATED TO A LT ADC FAILURE IAW MTSI 34-16/5936, R & R THE RT ADC AS A PRECAUTION IAW AMM 34-12-01-4, AIR DATA COMPUTER OPS NORMAL. ALSO PERFORMED TEST 30 AND 40 IAW AMM 22-00-00-2, LOWER LANDINGS MINIMUM (LLM). MAINTENANCE PRACTICES. THERE WAS NO EVIDENCE OF WATER FOUND IN MOISTURE TRAPS.