What was found
REF OPER 6821 - DURING O/2 DROP CHECK, MASK PANELS DID NOT OPEN AT SEATS 2AB, 13ABC, AND 28DEF. FOUND AT F-1 LTR CHECK. REPLACED PSU PANELS, OPERATION NORMAL.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
REF OPER 6821 - DURING O/2 DROP CHECK, MASK PANELS DID NOT OPEN AT SEATS 2AB, 13ABC, AND 28DEF. FOUND AT F-1 LTR CHECK. REPLACED PSU PANELS, OPERATION NORMAL.