What was found
DUE TO INADVERTENT DEPLOYMENT OF PASSENGER O2 MASKS, ACFT WAS MAINTENANCE FERRIED FOR REPLACEMENT OF O2 GENERATORS AND REPACKING MASKS WAS COMPLIED WITH. THE FLT DECK PASSENGER OXYGEN MANUAL DEPLOY SWITCH PANEL WAS FOUND NOT TO HAVE A SWITCH GUARD AND WAS ALSO REPLACED. OXYGEN MASK AT SEAT ROWS 23 AND 24 ABC FAILED TO DEPLOY. MAINTENANCE PERFORMED A DOOR LATCH MECHANISM TEST AND ALL CHECKED GOOD.