As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHIP 188 -RVSM- ALT DISAGREE EICAS MESSAGE AT FL360 ALTIMETERS FLUCUATING BETWEEN 120' AND 250' OFF. CORRECTIVE ACTION: R&R LEFT AIR DATA COMPUTER PER AMM B767-300 34-12. PERFORMED MCDP TEST 30 PER AMM 22-00. ALL TEST PASSED. (4163562)