What was found
FUEL IMBALANCE CAUTION OCCURRED IN CRUISE FLIGHT. FLIGHT CREW EXECUTED APPROPRIATE CHECKLIST. FUEL IMBALANCE CHECKLIST OCCURRED AGAIN AND APPROPRIATE CHECKLIST WAS EXECUTED AGAIN. THE FUEL BEGAN TO SHOW AN IMBALANCE AGAIN AND AT FIVE HUNDRED POUND IMBALANCE AC DIVERTED TO KABQ. ( CENTER TANK FUEL TRANSFER SYSTEM IS SUSPECTED CAUSE) CORRECTIVE ACTION PERFORMED BD500-A-J28-22-00-03AAA-320A-A CENTER TO WING XFER TEST. TEST PASSED, NO DEFECTS NOTED AT THIS TIME. OK FOR SERVICE. THIS CLEARS MEL AND ALL PLACARDS REMOVED