What was found
FLT NR 247, OAK-LGB, SMOKE DISCH AGENT 2, -AGENT2-DISCH, ECAM MESSAGE 30 MINUTES INTO FLIGHT. FWD AGENT SWITCH WAS MOVED TO AGENT 2. REMOVED AND REPLACED FIRE EXTINGUISHER BOTTLE (4010WX). REMOVED AND REPLACED SDCU (10WQ) PER MM 26-23-41 (4010WX) AND MM 2617-36 (10WQ). ACCOMPLISHED FUNCTIONAL TEST OF THE FIRING CIRCUIT PER MM 26-23-00-05 WITH NO DEFECTS NOTED. CARGO SMOKE DETECTION SYSTEM, OPS CHECK NORMAL PER MM 26-16-00.