As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON LANDING, ACFT PITCHED UP AND DOWN WITH NO PILOT CONTROL MOVEMENT AND CSAS PITCH LIGHT CAME ON. TROUBLESHOOTING AND INSP FOUND WIRE TERMINAL AT TB811 BROKEN. TB 811 PROVIDES AC GROUND FOR 3 AXIS P/R CSAS. WIRE BREAK WAS SUCH THAT INTERMITTENT CONTACT COULD OCCUR. UNCOMMANDED PITCH WAS DUPLICATED AND WOULD STOP WHEN WIRE CONTACT WAS MADE.