As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT ATT CALLED DURING TAXI TO REPORT FUMES IN CABIN, 1 MINUTE AFT ER APU START, FOLLOWED FIM 21-00 T806, SUPPLIED APU AIR & OPERATED PACKS FOR 30 MINS, NO FUMES AND NO SMELL IN THE CABIN AND COCKPIT. ALSO APU OIL QTY FULL APPEAR . NOTIFIED OTBD FLT CREW. OK TO CONTINUE FLT. ALSO NO SMOKE OR EVIDENCE IN CABIN AND COCKPIT.