As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR RETURN SMOKE IN AFT CABIN DURNING T/O CREW DUMPED FUEL TO 163,500 NORMAL LANDING AND STOP. RAN PACKS WITH APU AIR ALL PACKS OPERATED NORMAL. FLT CREW TAXI AND AND RAN ENGINES AT RUNUP AREA WITH MECHANIC, CHECKING PACKS WITH ENGINE AIR AT IDLE AND POWER. ALL PACKS OPERATED NORMAL, NO SMOKE IN CABIN. PERFORMED OVERWEIGHT LANDING CHECK PHASE 1, NO DAMAGE FOUND RETUNED A/C BACK TO SERVICE.