As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENG WHEN TAI IS SELECTED ON, VLV OPENS FOLLOWED BY INCREASE IN EGT. WHEN SELECTED OFF, EGT ROLLS BACK EICAS MESSAGE LT ENG ANTI ICE, WITH VLV LIGHT ILLUMINATED IN SWITCH. REPLACED NR 1 ENG ANTI ICE VLV IAW 30-21-03 UP TO PG 405 STEP 11. NEED TO CONT FROM STEP 11 TO END. ACCOMPLISHED ANTI ICE CHECK IAW MM 30-21-03, CHECKED OK.