As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - FLT 879 - OXYGEN MASKS DID NOT DROP AT SEATS 5A, 7A, AND 18A WHEN PASSENGER OXYGEN DEPLOYMENT SWITCH WAS INADVERTENLY ACTIVATED WITH AIRCRAFT ON THE GROUND. REPACKED ALL MASKS AND SUCCESSFULLY TESTED DROP SYSTEM. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)