As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - FLT 1025 - DURING PRE-FLIGHT, OXYGEN MASKS WERE INADVERTENTLY DEPLOYED BY FLIGHT CREW. OXYGEN CANISTER WAS NOT RIGGED PROPERLY. PROPERLY RIGGED CABLES TO OXYGEN CANISTER AT SEAT 20 DEF AND RESTOWED ALL OTHE MASKS. SYSTEM GROUND CHECKED, NORMAL OPERATION. (X)