What was found
ODOR DURING DESCENT. TURNED OFF LIVE TV SYS, ODOR WENT AWAY, COCKPIT ONLY. F/A'S DID NOT REPORT ODOR. SURVEILLANCE SYS NORMAL. LIVE TV MASTER SWITCH ON O/H TURNED OFF. ALL COCKPIT FUNCTIONS NORM. ODOR EMITTED FROM COCKPIT FRONT GASPERS. WHILE TRYING TO DUP WRITE UP ON GROUND W/MX SAME ODOR NOTICED WITH APU'S & BOTH PACS RUNNING. ODOR COMING FROM ECS (PACS & AC SYS) PILOT DEBRIEFED & INFORMED MX PACKS (ECS SYS) RUNNING SAME ODOR APPEARED IN COCKPIT & CABIN WITH LIVE TV SYS OFF, FOUND APU OVERSERVICED CKD. DECON OF ENVIRON CONTROL SYS. CHANGED RECIRC FILTERS & OZONE FILTERS. NO ODOR NOTICED. OPS & SYS CK FOR INFO MASTER SWITCH SHUTS SYS OF "LIVE TV" NOT CSS SYS. NO DEFECT NOTED WITH LIVE TV.