As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHIP 191 ALT FL 360 INTERMITTENT ALT DISAGREE HORN AND WARNING, R AP ENGAGED . L ALT AROUND 36220 FT , RT ALT 36000 FT. AFTER DESCENT TO FL 330 L ALT CREEPING UP TO 33300 FT WITH RT ALT LEVEL AT 33000 AND STANBY ALT AT 33650 FT . L ALT RESETTLED AT 33200 . CONTINOUS ALT DISAGREE. CORRECTIVE ACCTION: REPLACED LT ADC PER AMM 34-12. (4613175)