As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A/C HAD A FUEL IMBALANCE OF 100 LBS EN ROUTE TO TVC. CREW TRIED TO TRANSFER FUEL FROM THE LEFT TO THE RIGHT SIDE AND THE STANDBY FUEL PUMP MALFUNCTIONED. THE CREW RETURNED TO DTW FOR MAINTENANCE ACTION. REMOVED AND REPLACED LT FUEL PUMP IAW SAAB MM 28-22-15-04, S/N OFF: B1341, S/N ON: B1291.