What was found
SPEED DISAGREE SHOWS ON PFD CAPTAINS'S CAPT SIDE IAS DISAGREE PFD STD BY FO AGREE UP 9 KNOTS DIFF CREW REPORTED ALTITUDE FLUCTUATION ON CAPT SIDE,ALSO MENTIONED INTEGRATED STANDBY INDICATOR MATCHED ALTITUDE AND AIRSPEED ON FO SIDE. PERFORMED FLUSHING OF LEFT PITOT SYSTEM. REF AMM 34-11-00 DURING FLUSING PROCEDURE REMOVED SMALL AMOUNT IF CARBON LOOKING DEBRI. FLAGGING FOR IDT FOR THE QUICK DISCONNECT REINSTALL ON THE LEFT ADM. DUE TO MULTIPLE LEFT ADIRU FUALTS IN HISTORY DURING FLIGHT, REMOVED AND REPLACED LEFT ADIRU REF AMM 34-34-21-01. OPS CHECK GOOD.