What was found
FWD CARGO DOOR NOT CLOSED ECAM DURING PREFLIGHT, THE LOWER CARGO DOOR. WAS CLOSED AND LIGHT ECAM WENT OUT. RECEIVED THE ECAM AND CARGO DOOR LIGHT AGAIN DURING TAKEOFF ROLL. REJECTED THE TAKEOFF AT 70 KTS. REMOVED AND REPLACED THE CONNECTOR PLUG ASSY OF THE FWD CARGO DOOR SWITCH 14WS IAW ESPM 20-44-10, OPS CHECKED THE DOOR WARNING INICATION IAW 52-70-00-05-02, CHECKED GOOD,