What was found
(CAN) ON DEPARTURE, CREW IMMEDIATELY LOST POWER FROM THE NR 1 GENERATOR. ECAM RESET WAS CARRIED WITH NO FIX. APU WAS STARTED TO SUPPLEMENT ELECTRICAL POWER. CREW ELECTED TO RETURN WERE A AN OVERWEIGHT LANDING WAS CARRIED OUT. DUTY PILOT WAS ADVISED. FEEDER CABLE HARNESS REPLACED, WP:10563, PYLON CONNECTOR 400VC INSTALLED AND CONNECTED AT PYLON DISCONNECT TERMINAL BLOCK, WP:784230. OPS TEST OF ELECTRICAL POWER GENERATION AND DISTRIBUTION SYS PERFORMED. TEST OK. SYSTEM CONSIDERED SERVICEABLE.