As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DIRTY SOCKS SMELL REPORTED BY AFT FLIGHT ATTENDANT. COULD ALSO SMELL ODOR IN FLIGHT DECK. ACFT RETURNED TO GATE. APU LEAKING OIL, APU WAS PLACED ON MEL. ACCOMPLISHED WORK CARDS 26L0021001, 26L0021002 & DECONTAMINATION CARD 26L00021004 AS REQUIRED. MAINTENANCE REMOVED AND REPLACED THE APU ASSEMBLY PER JOB CARD 26L31049003. OPS AND LEAK CHECK OK. REMOVED MEL.