What was found
FLAP CAS CAUTION ON ROLLOUT AFTER LANDING - FLAPS STOPPED AROUND 13 DEGREES WHILE RETRACTING. CHECKED FLAP ERROR CODES, FOUND SEVERAL E211 CODES. INSPECTED LT INNER RESOLVER INSTALLATION. FOUND RESOLVER DRIVE PIN PULLED FROM SOCKET. FURTHER INSPECTION FOUND INBD LT FLAP DRIVE ARM ASSY, PN 527.52.12.153, CRACKED IN SEVERAL PLACES. PROBABLE CAUSE: UNKNOWN - NO RECORDED OVERSPEED ON ACFT'S CAS SYSTEM, NO SIGNS OF IMPACT DAMAGE OR SIDE LOADS, RIGGING OF FLAPS CHECKED OK, NO OTHER DAMAGE FOUND.