What was found
NR 1 FWD FUEL PUMP LOW PRESSURE LIGHT BLINKING. GROUNDED-YES. DISCONNECTED D72 AND RESET C/B P91 D1. WITH NR 1 FWD PUMP ON, 115VAC CONSTANT ON ALL THREE PHASES B737-800 WDM 28-23-11. PUMP INTERNAL CASE GROUND GOOD (.1 OHM) AND INSULATION >1M BETWEEN PINS 1, 2, 3 AND CASE GROUND 4, REF B737-800 AMM 28-22-00-760-802. RECONNECTED D72, NR 1 FWD PUMP OPERATIONS NORMAL, BUT RECOMMEND REPLACEMENT DUE TO ABNORMAL CHATTERING NOISE DURING OPERATION. REMOVED AND REPLACED NR 1 FWD BOOST PUMP, REF AMM 28-22-41-000-801 AND AMM 28-22-41-400-801. OPERATIONS CHECK GOOD.