What was found
DURING CLIMB, BETWEEN FL200 FL280, AN EICAS WARNING MESSAGE FOR ICE CON A/I INOPERATIVE. WHILE RUNNING THE CHECKLIST, THE MESSAGE DISAPPEARED. A FEW SECONDS LATER THE EICAS CAUTION MESSAGE E2N A/ICE FAIL, THEN NO ICE A/ICE ON APPEARED. WHILE RUNNING CHECKLISTS, GREY/WHITE THICK SMOKE FILLED FLIGHT DECK. FA CALLED AND SAID THERE WAS A LOUD NOISE FROM UNDER FUSELAGE. WHILE RUNNING CHECKLIST, SMOKE DISSIPATED, NOISE STOPPED. COUPLING ON DUEL VALVE DAMAGED AND LEAKING. R & R THE DUEL VALVE COUPLING. R & R THE NR 1 ACM. OPS AND LEAK CHECKED GOOD.