What was found
ETOPS SIGNIFICANT SYS - ABOUT 45 MIN FROM DESTINATION, F/O'S AIRSPEED INDICATOR JUMPED FROM 260 TO 285 & ALTIMETER WENT FROM 38,000 TO 38,200, VSI DOWN 1000' IAW MIN. CAPT'S INSTRUMENTS NORMAL. EICAS MESSAGES: OVERSPEED IAS DISAGREE, ALT DISAGREE, RUDDER RATION & AILERON LOCKOUT. REPLACED NR 2 ADC. GND CK OK IAW MM 34-12-01. TEST 30 OK IAW MM 22-00-02. ACCOMP FIM 27-48-00, FIG 106 FOR STAB TRIM MSG, ACCOMOP FIM 27-11-00, FIG 104 FOR AILERON LOCKOUT - BOTH TEST OK.