As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT NR 1 FUEL LOW PRESSURE LIGHT AND MASTER CAUTION LIGHT WILL NOT ILLUMINATE WITH SWITCH IN OFF POSITION. GROUNDED-YES. PERFORMED OPERATIONAL TEST OF NR 1 FUEL TANK AFT BOOST PUMP PRESSURE SWITCH, PER B737-800 AMM 28-42-11 TEST-PASS. REMOVED AND REPLACED NR 1 TANK AFT FUEL PUMP LOW PRESSURE SWITCH, IAW AMM 28-42-11-000-420-801. OPERATIONS CHECKED, IAW AMM 28-42-11-700-801 GOOD, NO LEAK NOTED.