As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STAB TRIM CH1 INOP MESSAGE INFLIGHT - WAS ABLE TO RESET, BUT CONTINUES TO FAIL EVERY FEW MINUTES; IE, FAILED 7 TIMES IN 20 MINUTES. REMOVED AND REPLACED HSTA AND MOTOR CONTROL UNIT IAW 27-42-01. OPS CHECK GOOD. AIRCRAFT RETURNED TO CAT II STATUS. HSTA P/N: 8396-3 S/N ON: 311 S/N OFF: 555.