As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 5587 - DURING CLIMBOUT OF AUS WITH AUTO-PILOT ON, THE AIRCRAFT BEGAN PITCHING UP AND DOWN WITH YOKE MOVEMENT FORWARD AND AFT. FLIGHT DIRECTOR NR 1 AND 2 DID NOT MATCH. CREW DECLARED AN EMERGENCY AND FLIGHT RETURNED TO THE FIELD. PURGED NR 1 AND NR 2 PITOT LINES OF MOISTURE AND TIGHTENED NR 1 PITOT Q/D FITTING. PERFORMED LEAK CHECK OF NR 1 AND NR 2 PITOT AND STATIC SYSTEMS, NO DISCREPANCIES NOTED.