As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTS ROLL CONTROL STIFF OR BINDING ON APPROACH. FOUND RIGHT AILERON ACTUATOR CAUSING PROBLEM. SYSTEM CHECKED FREE UNTIL HYDRAULIC PRESSURE APPLIED, THEN RESTRICTION NOTICED UPON QUICK APPLICATION OF INPUT. UNIT CURE DATE OF 4Q77, TNS/TSO UNK 15150.4 ACTT, 10479 LDGS.