As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
#1 AFT MAIN FUEL PUMP LOW PRESSURE LIGHT DID NOT ILLUMINATE WHEN TURNED OFF. GROUNDED - YES. VERIFIED N O HARD FAULT FOUND. REMOVED AND REPLACED AS A PRECAUTION L/H AFT FUEL BOOST PUMP PSI SWITCH REF B737-900 AMM 28-42-11. OPS AND LEAK CK GOOD. NO DEFECTS NOTED.