As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UNABLE TO MOVE AILERON TRIM KNOB IN CRUISE FLIGHT. INSPECTED AILERON TRIM TAIL SYSTEM. FOUND AFT ACTUATOR TO HAVE WATER CONTAMINATION. CLEANED, INSPECTED AND LUBED LEFT AND RIGHT TRIM ACTUATOR AS PER DC9 O/H MANUAL 27-10-6. PERFORMED AILERON TRIM CONTROL CABLE TENSION CHECK AND AILERON TRIM TAB TRAVEL CHECK. OPS CHECKED GOOD IAW DC9 MM 27-10-02. NO FURTHER DEFECTS NOTED.