What was found
FUMES AND LIGHT HEADED CABIN CREW REPORTED. PILOTS HAD NO SYMPTOMS REPORTED AT APPROXIMATELY 45 MINUTES INTO FLIGHT EMERGENCY RETURN TO HNL QRC/QRH SMOKE /FUMES PROCEDURE ACCOMPLISHED . RT PACK TURNED OFF FUMES REPORTED DISSIPATED. GROUNDED - YES. DIVERSION -- ACCOMPLISHED SMOKE OR FUMES IN CABIN CONDITIONAL INSPECTION. REPLACED BOTH RECIRCULATION AIR FILTERS. REF B737-800 AMM 21-25-01 DID NOT DETECT ANY FUMES OR ODOR FROM THE CABIN. VERIFIED WITH MULTIPLE PERSONNEL. REF AMM TASK 05-51-56-200-801 B737-800 FIM 05-51 TASK 814 REF AMM 49-16-11.