As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BURNING ODOR SENSED THROUGH GASPERS AFTER APU BLEED TAKE-OVER W/ ENGINES RUNNING. C/W FIM TASK 21-20-00, SMOKE AND/ OR ABNORMAL SMELL IN PAX CABIN AND/OR COCKPIT, SMOKE / SMELL IN THE CABIN CAUSED BY THE APU TASK 49-10-00-810-813A. COULD NOT DUPLICATE.