As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 9513 - ON A MAINTENANCE FERRY FLIGHT MGM TO CLT, THE BACK UP TRIM SYSTEM WAS INOPERATIVE IN THE UP POSITION. RETURNED TO THE FIELD FOR THE CAPTAIN AND F/O YOKE TRIM SWITCHES WERE INTERMITTENT. MAINTENANCE REMOVED AND REPLACED BOTH SWITCHES. OP CHECKS GOOD. (M)