What was found
FLAPS FAIL AMBER CAS: AFTER TAKEOFF, FLAPS WERE SELECTED UP AT FRA (FROM FLAPS 1). FLAPS FAIL CAS POSTED AND WE FOLLOWED THE FLAP FAIL APPROACH/LANDING QRC. FLAPS DID NOT RETRACT. WE RETURNED TO THE DEPARTURE AIRPORT AND LANDED WITH FLAPS 1. CORRECTIVE ACTION: REMOVED FLAP CONTROLLER AND INSTALLED INSPECTED CONDITION FLAP CONTROLLER IAW CE680A AMM 27-50-25. PERFORMED FLAP MOVEMENT CHECKS IAW CE680A AMM 27-50-00. OPS AND FUNCTIONAL CHECKS GOOD WITH NO DEFECTS NOTED.