As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE AT FL 360 CAPTAIN`S AIRSPEED DECREASED 10KT COMPARED TO STANDBY & FIRST OFFICERS AIRSPEED THEN CAPTAINS AIRSPEED DECREASED 30KT IN DESCENT. DRAINED MOISTURE FROM PITOT SYS IAW AMM 34-13-00. PERFORMED OPERATIONAL CHECK OF ADC SYS IAW AMM 34-15-00. OPERATIONS CHECKED GOOD. ACFT OK FOR SERVICE. AMT IS NOT AUTHORIZED FOR CAT II. ACFT IS NOT CAT II OPERATIONS.