As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER RUNNING A GOOD STAB & MACH TRIM TEST, STAB CH 1 DROPPED OFF LINE FOR NO APPARENT REASON AND WOULD NOT REENGAGE. POWERED DOWN A/C AND POWERED UP. NO DEFECTS NOTED AT THIS TIME. REPLACED CAPT'S TRIM SWITCH DUE TO PREVIOUS DISCREPANCIES. HSTC SYSTEM OPERATIONAL CHECKS GOOD IAW AMM 27-41-00.