What was found
F/A'S COMPLAINING OF AN ODOR AND SMELL IN FORWARD AND AFT CABIN, BURNING THEIR EYES- COUGHING- THROAT IRRATION- ALSO PILOTS SMELLED AND NOTICED SOME KIND OF IRRATION IN THROATS IN CRUISE AND ENGINE S/D. MAINTENANCE FOUND THE APU TO BE SOURCE OF CABIN ODOR PER J/C 26L00021001 (T/S CABIN ODOR). REMOVED AND REPLACED APU TURBINE CAVITY VENT O-RINGS PER AMM 49-91-53 AND APU UPPER INTAKE PLENUM PER AMM 49-18-48. COMPLIED WITH J/C 26L31049009 (APU LOAD COMPRESSOR WASH) AND 26L0002100 (DECONTAMINATION).