What was found
DURING SHUT DOWN, FLIGHT ATTENDANT REPORTED A STRONG, DIRTY SOCK ODOR IN THE AFT CABIN. THE ODOR WAS ALSO NOTICED DURING FLIGHT AT CRUISE NEAR AFT LAVATORY. THE AIRCRAFT WAS GROUNDED. MAINTENANCE REPLACED THE APU BLEED DUCT SEAL BELOW SEAT ROW 24 IAW AMM 36-12-41. MAINTENANCE ALSO ACCOMPLISHED JC 26L0002001, 26L00021005, AND 26L00021004.