As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT #1 MAIN FUEL PUMP "LOW PRESSURE" LIGHT ILLUMINATED ON CLIMB AND REMAINED AT CRUISE. THE TANK HAD 8500 LBS IN IT. GROUNDED - YES. REPLACE #1 AFT MOTOR IMPELLER BOOST PUMP. CLOSED 1 EA CIRCUIT BREAKER. GROUND VERIFICATION TEST SUCCESSFUL.