As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STAB TRIM AND MACH TRIM MESSAGE AFTER TAKEOFF. RE-ENGAGED BOTH SYSTEMS. BOTH SYSTEMS FAILED AGAIN. RETURNED TO SLC. REMOVED AND REPLACED HSTA WITH A SERVICEABLE UNIT IAW AMM 27-42-01. ALSO REMOVED AND REPLACED MCU WITH A SERVICEABLE UNIT IAW AMM 27-42-05. PERFORMED OPS CHECKS OF HSTCA & MCU PER MM 27-40-00. OPS CHECK GOOD. CAT II UPGRADE. HSTA S/N OFF: 951, MCU P/N: 7062-3, S/N ON: 606, S/N OFF: 468.