As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WITH E1 ON, ON TAXI OUT BURNING SMELL IN FLT DECK AND CABIN WITH EITHER PACK ON. INSPECTED PACK 1 AND PACK 2. FOUND BROKEN SECTION OF PIPE. SUSPECT BROKEN SECTION OF PIPE SUCKED INTO PACK 2 SYSTEM R & R EMERGENCY VENTILATION PIPE ON PACK NR 2 THAT CONNECTS TO RAM AIR VALVE IRW 21-25-01. OPS AND LEAK CHECK GOOD