What was found
CREW AS WELL AS PASSENGERS REPORTED A STRONG ODOR IN THE CABIN. DIFFICULT TO ISOLATE SOURCE, IT SMELLED LIKE HUMAN WASTE AND/OR VOMIT. ODOR INTENSIFIED AFTER TAKEOFF. THE AIRCRAFT WAS GROUNDED. MAINTENANCE ACCOMPLISHED MCM 05-96-70, AND MCM 38-94-14. REMOVED, CLEANED, AND REINSTALLED FOWARD DRAIN BLADDER OF L1 DOOR AND R1 DOOR SILL IAW AMM 38-31-03-000-802. MAINTENANCE ACCOMPLISHED A GREY WATER SYSTEM CLEANING ON THE L4 DOOR AND R4 DOOR IAW AMM 38-31-00 100-801, AND PERFORMED SATISFACTORY OPERATIONAL CHECK.