What was found
WHEN THE CREW SELECTED 40 DEGREES OF FLAPS DURING APPROACH FOR LANDING, THE AIRCRAFT ROLLED TO THE RIGHT UNCOMMANDED. CREW WAS ABLE TO CORRECT THE ROLL OF THE AIRCRAFT WITH FOUR UNITS OF LEFT WING DOWN AILERON. THE LANDING WAS COMPLETED WITHOUT INCIDENT AND THE AIRCRAFT TAXIED TO THE GATE. MAINTENANCE FOUND THE LT MOVEABLE FLAP VANE STICKING ON THE VANE GUIDE AND LUBRICATED THE VANE GUIDE. OPERATIONAL CHECKS WERE GOOD AND THE AIRCRAFT HAS RETURNED TO SERVICE.