Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument
Training / Qualification
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Overcame Equipment Problem
Aircraft; Human Factors
At 11;000 ft. climbing after takeoff the FA (Flight Attendant) called the flight deck and informed the flight deck that a PSU (Passenger Service Unit) deployed over two passenger seats. I thought that we needed to reseat the passengers; alter our planned flight level or repack the oxygen masks. [Another FA] went back to see about repacking the masks. He called me and said the masks were not activated and stowed as requested. During climb I attempted to get guidance from the EFB (Electronic Flight Bag) to confirm or contradict my options. After a busy climb to altitude the FO (First Officer) found the source for unwanted mask deployment. Repacking was not an option so the passengers were relocated.The information was not in the manuals that I thought they would be in. When I did a general search numerous links came up and it was difficult to filter out during the numerous heading; altitude and frequency changes occurring out of ZZZZ. I elected to continue the climb and search for the answer at cruise.
B777-300 Captain reported inadvertent oxygen mask deployment over 2 seats in the cabin during climb.