As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 1111, JFK-CUR. RETURNED TO FIELD. EMERGENCY DECLARED. FUMES IN CABIN DIRTY SOCK SMELL BY F/A AND DHD FLIGHT CREW; C/W INFO NOTICE 2017-TO15F SECTION B - LEVEL 2 ODOR. FOUND OIL LEAK ON APU FAN ASSY GASKETS. R & R APU FAN ASSY PER AMM 49-52-51. OPS CHK OK. LEAK CHK OK. RAN APU BLEED 20 MIN.