As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 270 - HNL-KOA - EN ROUTE TO KONA, AIRCRAFT PRESSURIZATION FAILED. RETURNED TO HNL. UNEVENTFUL LANDING. FOUND AC AND DC MANUAL C/B'S OPEN FOR PRESSURIZATION CONTROL. REMOVED AND REPLACED CABIN PRESSURE CONTROLLER. GROUND CHECK OK. AIRCRAFT RETURNED TO SERVICE. (M)