What was found
F-CTL FLAP SYS 2 FAULT ECAM, REPEAT. DEFERRED ON DF 923 IAW MAINT PROCEDURE NO FAULTS NOTED ON MCDU TESTS & COLLARED CB FLIGHT CONTROL-FLP-CTL & MONG SYS 2 ON 121VU PNL. ALSO DEFERRED IAW MEL CARD 73167. REPLACED FLAP CSU IAW AMM, GROUND CHECKED NORMAL NO DEFECTS NOTED.