As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAKEOFF, FUMES DETECTED MOSTLY IN REAR CABIN AREA. SHUTOFF THE NR 2 PACK AND ODOR CLEARED. AT LEVEL OFF RE ESTABLISHED THE NR 2 PACKON. NO ADDITIONAL ODOR REPORTED. MAINTENANCE REPLACED THE APU OIL HEATER IAW AMM 49-96-11-000-801-A AND 49-96-11-400-801-A. A SATISFACTORY LEAK AND OPERATIONAL CHECK WAS ACCOMPLISHED. AIRCRAFT WAS GROUNDED.