As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMOKY SMELL IN CABIN AFTER TAKEOFF, CREW SHUT OFF APU AIR AND SWITCHED TO ENGINE AIR, OPERATED ON NR 2 PACK AND SMOKY SMELL DISSIPATED. MAINTENANCE PERFORMED DUCT CONTAMINATION CLEARING PROCEDURE COULD NOT DUPLICATE SMELL, SYSTEM OPERATES NORMALLY ON ALL ENGINES AND APU AIR.