As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OXYGEN PANEL OPENED AT SEATS 12 ABC, MEL 3521A COMPLIED WITH. SEATS CANNOT BE OCCUPIED. DROP CK REQUIRED PER AMM AFTER REPAIR OF O2 CONTAINER. THE AFFECTED SEATS ARE IN ROW 13ABC NOT 12ABC. SEATS AT ROW 13ABC ARE CORRECTLY BLOCKED OUT, AMM TASK SYS TEST. REPLACED PSU OXYGEN PANEL AT SEATS ROW 13ABC. ACCOMPLISHED MANUAL O2 MASK DROP CHECK.