As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOS - CREW REPORTED WARNING ON CENTER FUEL PUMPS. LEFT FAULTED IN FLIGHT AND RIGHT PUMP ALREADY ON MEL. FLIGHT RETURNED BOS LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED LEFT AFT FUEL PRESSURE SWITCH. SYSTEM GROUND CHECK NORMAL OPERATION.