What was found
SDAC 1 FAULT DISPLAYED ON UPPER ECAM SCREEN, RESET NO HELP. SWAP SDAC 1 & 2, NOTE MRS IAW AMM 31-55-34-401, PCN 482-9503. UNABLE TO RESET SDAC 1, SWAPPED WITH SDAC 1 & APPLIED MEL IAW AMM 31-55-34-401. SDAC 2 IS NOW INOPERATIVE. SDAC 1 TESTED NORMAL. STICKER APPLIED NEXT TO LOWER ECAM. NR 2 SDAC IAW MM31-55-34-400 -001-A,31-50-00-710-001-A, IPC31-54-08-02A, MR31541-149 NR 1 POSITION & MR31541-103 NR 2 POSITION.