As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STAB TRIM CHANNEL NR 2 WILL NOT ENGAGE. REMOVED AND REPLACED HSTCU WITH SERVICEABLE UNIT IAW MM 27-41-01. PERFORMED OPS CHECK 5 TIMES FROM BOTH TRIM SWITCHES. OPS CHECK GOOD. PERFORMED HSTCU SELF-TEST IAW MM 27-41-00 4 TIMES. NO FAULTS NOTED. OPS CHECK GOOD. RETURNED TO CAT II STATUS. P/N OFF: 7060-8, S/N OF: 1117, P/N ON: 7060-7, S/N ON: 174.