As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT FORWARD FUEL BOOST PUMP LOW PRESSURE LIGHT ILLUMINATED JUST PRIOR TO DEPARTURE. 8400 LBS IN THE TANK. GROUNDED - YES. REMOVED AND REPLACED LEFT FORWARD BOOST PUMP PRESSURE SWITCH. REF B737-800 AMM 28-42-11 FUEL BOOST PUMP PRESSURE SWITCH OPS TEST GOOD NO LEAKS.