As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLIMBING THROUGH FL90, FLIGHT ATTENDANT REPORTED STRONG SMOKEY ODOR IN THE MID CABIN. CREW RAN QRH AND ODOR DISSIPATED. ON RESUMPTION OF CLIMB POWER ODOR RETURNED. RETURNED TO DEPARTURE. MAINTENANCE PERFORMED THE NO GO ODI PREVENTION WORK CARDS 2120-2367 AND 2120-2368 AND A FULL DUCT BURNOUT. NO ODOR WAS PRESENT. THE AIRCRAFT WAS RETURNED TO SERVICE.