As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN ODOR IN ENTIRE CABIN FROM ENG START FOR ENTIRE LEG. VERY STRONG IN FLIGHT & DESCENT, RESULTED IN THE CREW EXPERIENCING HEADACHES & EYE IRRITATION. AIRCRAFT WAS GROUNDED. THE CAUSE WAS THE APU. MAINTENANCE REPLACED APU IAW TC 26L31049005 AND ACCOMPLISHED A SATISFACTORY OPS CHECK.