What was found
AIRCRAFT WAS NOT GROUNDED: AFTER LEVEL OFF AT CRUISE, WHEN SELECTING CENTER FUEL PUMPS ON TO BURN 500LBS OF FUEL FROM CENTER TANK, RIGHT CENTER FUEL PUMP LOW PRESSURE CAUTION LIGHT ILLUMINATED. ONLY THE LEFT CENTER PUMP WAS WORKING, CAUSING A FUEL IMBALANCE. PRIMED RIGHT CENTER FUEL PUMP, PER FIM 28-22-00-810-802. GFI NOT TRIPPED AND OPERTIONAL CHECK GOOD, NO FAULT FOUND**(CLOSED).