What was found
DURING CLIMB OUT, PASSING 12,000 FT, RECEIVED AN ALT DISAGREE AMBER EICAS. ALSO, INTERMITTENT IAS DISAGREE. RAN QRH AND LEVELED AT FL260. CAPTAIN`S ALTIMETER AT 14,000 FT AND F/O'S SHOWED 13,750 FT. CAPTAIN`S ALTIMETER AT FL 240, F/O'S INDICATED FL 237. AT FL 260 ON CAPTAIN`S ALTIMETER, F/O'S INDICATED 25,640 FT. REMOVED AND REPLACED THE RIGHT AIR DATA COMPUTER IAW MM 34-12-01-4. ALL TESTS PASSED, AND OPS CHECKED GOOD. OK TO CONTINUE.