What was found
FLT 755, ENROUTE. DURING CABIN DEPRESSURIZATION EVENT, O2 MASKS DID NOT DEPLOY AT F/A SEATS BY DOORS 1R, 4L, AND 4R, AND AT PASSENGER SEAT POSITIONS 13E/F, 13G/H, 26G/H, 29G/H, 32E/F, 32G/F, AND 33E/F. MAINTENANCE REPLACED THE SOLENOID ACTUATORS FOR SEATS AT THE AFFECTED POSITIONS. MAINTENANCE ALSO REPLACED ALL SPENT OXYGEN GENERATORS IN THE CABIN.