As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED. LEFT AFT FUEL PUMP PRESSURE LIGHT CAME ON DURING CRUISE AT FL230. TURNED PUMP OFF ACCORDING TO PROCEDURES. FUEL QUANTITY 5.0 SMOOTH AIR. ACCOMPLISHED FAULT ISOLATION TEST OF THE LEFT AFT FUEL PUMP PER FIM 28-22-00-810-803. OPERATIONAL CHECK GOOD.