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 MAIN FUEL PUMP LIGHT CAME ON INFLIGHT WHEN TOTAL FUEL IN LEFT TANK HIT APPROXIMATELY 5000 LBS. DURING TROUBLESHOOTING, PER FIM 28-22-00-810-803, FOUND LIGHT INDICATION TO BE OPERATIONAL. LEFT AFT BOOST PUMP DID NOT OPERATE NORMAL. **SUPPLEMENTAL REPORT WILL BE SUBMITTED**(OPEN).