As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT ENG ANTI-ICE EICAS MESSAGE AND LT ENG DISAGREEMENT LIGHT ILLUMINATED IN FLIGHT. AIR RETURN WAS DONE. R & R LT ENGINE TAI VALVE IAW AMM30-21-03-404- 016, OPS AND LEAK CHECKS OK. ROTABLE PARTS CHANGE WAS INDICATED - TT 1537808, SN OFF 01011, VALVE, ANTI-ICE OFF 19-3021-9-0001 1011 ON 19-3021-9-0001 2811.