As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: PILOT REPORTS STRONG ODOR RETURNED DURING CRUISE. ISOLATED AND LOCALIZED TO THE AREA AROUND THE TRASH BIN IN THE AFT GALLEY. MAINTENANCE ACCOMPLISHED CARD 05-96-70. FOUND AFT SILL DRAIN VALVE CONTAMINATED . REMOVED AND REPLACED AFT SILL DRAIN VALVE IAW AMM 38-31-06-000-802. ODOR DIMINISHED. OK FOR SERVICE.