As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
F/A REPORTED A CABIN ODOR THROUGH OUT ENTIRE CABIN ON ENTERING THE ACFT AT THE GATE. AIRCRAFT WAS GROUNDED. MAINTENANCE HAS DETERMINED THE APU IS THE SOURCE OF THE ODOR. MAINTENANCE REPLACED APU IAW JOB CARD 26L31049005 AND ACCOMPLISHED SATISFACTORY OPS CHECK.