As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN FLIGHT MAIN TANK AFT NUMBER TWO FUEL LOW PRESSURE LIGHT ILLUMINATED. GROUNDED-YES. REF B737-800 FIM 28-22 TASK 805, FOUND R20 GFI TRIPPED. GVI OF NR 2 AFT PUMP CONNECTOR, NO DEFECTS FOUND. RESET NR 2 AFT PUMP C/B AND RESET GFI, BOOST PUMP OPERATED, BUT WITH IRREGULAR HUMMING SOUND. REMOVED AND REPLACED NR 2 AFT FUEL BOOST PUMP, IAW B737-800 AMM 28-22-41/401. NR 2 AFT FUEL BOOST PUMP OPERATIONS TESTED NORMAL AND LEAKS CHECKED OK.