As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN FLIGHT FA REPORTED STRONG EXHAUST ODOR IN THE CABIN CAUSING HER THROAT AND HEAD TO HURT. DESCENDED TO FL240 AND SWAPPED TO THE APU BLEED. FA INITIALLY NOTED THAT THE SMELL IMPROVED BUT LATER CALLED US SAYING THE ODOR WAS BACK. PILOTS CONFIRMED THERE WAS A STRONG ODOR IN THE CABIN AFTER PARKING AT THE GATE. (FLIGHT 3784) REMOVED AND REPLACED RT ENGINE IAW TASK CARD 72-400-1000-SKY AND AMM 71-00-00.