What was found
HNL - FLT 938 - UPON ENTERING AREA OF POSSIBLE ICING WE TURNED ON WING ANTI-ICE. AFTER ABOUT 30 SECONDS TO 1 MINUTE MANIFOLD NR 1 FAIL LIGHT CAME ON, COMPLETED, CHECKLIST. AIRCRAFT RETURNED TO HNL, WHERE IT MADE AN UNEVENTFUL LANDING. (M)