What was found
ELAC 2 FAULT DISPLAYED ON UPPER ECAM SCREEN. CONFIRMED NR 2 ELAC COMPUTER IS BAD. SWAPPED BOX INTO THE NR 1 ELAC POSITION & MEL NR 1 ELAC SYSTEM INOPERATIVE. ACFT DOWNGRADED TO CAT 1. SN OF NR 1 ELAC IS 1039, SN OF NR 2 ELAC IS 5084. ALL DDPG IAW DF0980. REPLACED ELAC 1 IAW MM 27-93-34 & ACCOMPLISHED TEST IAW 27-93-00,TESTED OK, NO FAULTS & NO MESSAGES. ACCOMPLISHED LAND CAT 3 CAPABILITY TEST, TESTED OK. ACFT BACK TO CAT 3 STATUS, PLACARD REMOVED.