What was found
AFT LT LAV O2 MOD DOOR WILL NOT CLOSE LAVATORY OXYGEN MODULE. AFT LAV (LT) O2 MASK DROPPED ON LANDING IN DTW. C/A: FWD TO MCC , MEL 35-21-02 , "M" PROCEDURE CW , DISPATCH APPROVED , PLACARD INSTALLED. REMOVED AND REPLACED 203 LAV O2 CONTAINER ASSY PER AMM 35- 21. CHECKS GOOD. MEL AND PLACARD REMOVED. M PROCEDURES REMOVED. (LP: 7792992)