As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RECEIVED EFIS COMP FOR IAS (INTERMITANTLY) AT FL330, C/W QRH CORRECT AIR SPEED INDICATION WAS HARD TO DETERMINE, BOTH SIDES READ CORRECT AT DIFFERENT TIMES. CHOSE ADC 2 AND AP DIDN'T MAINTAIN ALTITUDE, CHOSE ADFC 1 AP WORKED BUT AIRSPEED (SLOWLY). PURGED (BOTH) MAIN PITOT STATIC SYSTEMS IAW AMM 34-11-00. REMOVED AND REPLACED ADC NR 1 IAW AMM 34-13-01, OPS CHECKS GOOD. LEAK CHECKS GOOD RII I-180.