What was found
(CAN) PRIOR TO TOUCHDOWN THE AIRCRAFT ROLLED TO THE RT. FLIGHT SPOILERS WERE SELECTED, BOTH EXTENDED AT FIRST THEN THE LT SPOILER SUDDENLY RETRACTED TO THE '0' POSITION AS A RESULT OF THIS THE AIRCRAFT IMMEDIATELY ROLLED TO THE RT. THE PILOT CORRECTED THE CONDITION BY TURNING THE CONTROL WHEEL TO THE LEFT. ON GROUND, MAINTENANCE INSPECTED THE SPOILER SYSTEM AND IT WAS NOTICED THAT THE BALL JOINT ON THE SPOILER CABLE HAD SEPARATED.