As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GNDED. FLIGHT ATTENDANTS REPORTED HAVING HEADACHES DUE TO A STRONG DIRTY SOCK SMELL IN PAX CABIN DURING CLIMB OUT & DURING TAXI TO GATE. ACCOMPLISHED TASK CARDS 26L00021001 & 26L00021002, DETERMINED THE APU WAS THE SOURCE OF THE ODOR. REPLACED APU GEN & ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK IAW AMM 24-23-51, TASK CARDS 26L00021001, 26L00021002 & 26L00021004 WITH NO ODORS BEING DETECTED.