As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EFIS COMPARATOR MONITOR MESSAGE ILLUMINATED INFLIGHT WITH IAS FLAGS ON BOTH SIDES. CAPTAIN''S AIRSPEED NOTED 40 TO 50 KNOTS LESS THAN FIRST OFFICER''S. AFTER ONE MINUTE MACH TRIM AND STALL FAIL MESSAGES APPEARED. (CAT II) PURGED PITOT/STATIC SYSTEM REMOVED AND REPLACED NR 1 ADC. P/N 822-0372-140, S/N OFF 1022, S/N ON 1478 CAT II IAW 34-13-01.