What was found
AFTER SELECTING FLAPS TO 15 DEGREES ON DOWNWIND, RECEIVED ''FLAP ASYMMETRY'' WARNING. RIGHT INBOARD FLAP INDICATED 2 SEGMENTS BEYOND 15 DEGREES. INITIATED GO-AROUND. COMPLETED QRH PROCEDURE. SUBSEQUENT LANDING UNEVENTFUL. REMOVED AIRCRAFT FCU AND BENCH CHECKED IN AVIONICS. COMPUTER CHECKS GOOD ON BENCH. FOUND RIGHT INBOARD FLAP ACTUATOR POTS READING ERRATIC. REMOVED RIGHT INBOARD FLAP ACTUATOR AND REPLACED IT WITH A SERVICEABLE ONE IAW EMB MM 27-50-07. OPS AND LEAK CHECKS GOOD. FCU REINSTALLED.