What was found
ENROUTE FROM MKE TO PHX FUEL IMBALANCE OCCURRED, CROSS FEED VALVE OPEN LIGHT WAS BRIGHT IN BOTH ON AND OFF POSITIONS. DIVERTED TO DEN WITHOUT FURTHER EVENT. MAINTENANCE REMOVED AND REPLACED FUEL SHUT OFF VALVE ACTUATOR ASSEMBLY LOCATED ON CROSS FEED VALVE IAW BMM 28-22-21-4, OPERATIONAL CHECK WAS GOOD. VENDOR TEARDOWN OF FUEL SHUT OFF VALVE ACTUATOR S/N 3269 CONFIRMED FAILURE OF UNIT. UNIT WAS FOUND CORRODED AND CONTAMINATED WITH MOISTURE CAUSING BEARING TO FREEZE. UNIT COMPLETELY OVERHAULED AND FUNCTIONAL TESTED PER OHM 28-20-33.