What was found
ON CLIMBING, ENTERING ICE CONDITION, GOT 4 OPEN BUT GOT BLD 1 VLV FAIL & BLD CLOSED WHEN ICING TURNED OFF. FAIL MSG ADV CLEARED ON DESCENT, IN ICING GOT BLD1 FAIL BUT NO BLD CLOSED ADVS ON THE GND, WE DESELECTED BLD 1 CLOSED BUT GOT NO CLOSED MSG OR FAIL. R & R ENG 1 BLEED SWITCH IAW AMM 20-13-04. COMPLIED WITH OPERATIONS CHECK IAW AMM 36-11-05. NO DEFECTS NOTED.