As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF FLIGHT ATTENDANT CALLED AND REPORTED A STRONG BURNING SMELL IN THE FRONT AND REAR OF CABIN. RETURNED TO AIRPORT.-PERFORMED IDENTIFICATION OF CABIN ODOR IAW TSM 05-50-00-810-831-A + CAUSE BEING ENGINE 1 OR 2 IAW TSM 71-00-00-810-801-A. ODOR COULD NOT BE REPLICATED WITH APU OR #1 OR #2 ENGINE AT IDLE OR HIGH POWER. A/C OK FOR SVC AT THIS TIME.