What was found
NR 1 MAIN TANK, AFT LOW PRESSURE ILLUMINATED DURING CRUISE WITH 8500 LBS OF FUEL IN THE NR 1 MAIN TANK. ACFT GROUNDED. ACCOMPLISHED WIRING CHECKS IAW TSR 701389 AND FOUND W1136-3601B-16 CHAFED CAUSING ARCING BY D70 CONNECTOR ON THE NR 1 TANK AFT BOOST PUMP. REPAIRED THE WIRE W1136-3601B-16 IAW WDM 28-23-11 AND SWPM 20-10-15. ACCOMPLISHED GROUND VERIFICATION CHECK IAW AMM 28-22-00-730-801 FOR THE PUMP.