What was found
(CAN) DURING APPROACH WHEN ATTEMPTING TO START APU , LOST AC BUSS 1 AND ESSAC , NR 1 GENERATOR WOULD NOT RE-SET, AIRCRAFT LANDED NORMALLY. MAINTENANCE INSPECTION FOUND CHAFING OF THE 'B' PHASE (YELLOW STRIPE) NR 1 ENGINE GENERATOR WIRING CHAFED TO GROUND AT THE LT TOP FWD COWL (WIRING BUNDLE CONTAINING FEEDER CABLE AND GEN CONTROL WIRING), ALSO FOUND CHAFING OF THE NR 1 GENERATOR 'RED STRIPE' WIRING AT PYLON COVER. NOTE: PREVIOUS SIMILAR EVENT ON THIS AIRCRAFT HAD BEEN BLAMED ON CONTAMINATION OF THE CONNECTOR (1XB-7R), PROBLEMS WERE SEVERAL DAYS APART.