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 WHEN ENGAGED AND TRIM IS TRIED, IT DISCONNECTS. STAB TRIM CHANNEL NR 1 OK. REMOVED AND REPLACED TRIM ACTUATOR AND MOTOR CONTROL UNIT IAW MM 27-40-00, 27-42-01 & 27-42-05. OPS CHECKS GOOD. ACTUATOR PN OFF 8396-3 SN OFF 715.