As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT# 123, JFK-LAX(AIRTURN TURNBACK TO JFK). -FUMES EVENT A COUPLE MINUTES AFTER LIFTOFF. -#4 FA CALLED FROM AFT GALLEY TO REPORT DIRTY SOCKS ODOR IN AFT GALLEY AND MID CABIN; COMPLIED W.INFO NOTICE 2017-T015. STEP 1 ISOLATED FAULT TO TYPE 10, AMBIENT AIR ODOR PER TSM 05-50-00-810-085-B A/C OK FOR SVC. DUE TO AIR RETURN EVENT. ACCOMPLISHED DECONTAMINATION LEVEL A WAS ACCOMPLISHED PER AMM 21-00-00-615-802-A. NO ODOR. NO EVIDENCE OF OIL LEAKAGE IN ENGS 1+2 OR APU. AIRCRAFT OK FOR SERVICE.