As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
L AOA PROBE EICAS MESSAGE RIGHT AFTER TAKEOFF DEBRIEFED FLT CREW UPON ARRIVAL. THEY NOTED THAT THE L AOA LIGHT AND EICAS MSG REMAINED ON FROM TAKEOFF UNTIL APPROACH WHEN BOTH THE LIGHT AND EICAS MSG BOTH WENT OUT. THEY WERE IN KNOWN ICING CONDITIONS WHICH WARRANTED THE AIR RETURN. R/R CAP AOA SENSOR REF AMM 34-12-03/401. OPS CHECK PASS, NO EICAS MSG PRESENT.