As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) IN CLIMB CREW NOTICED A FUEL IMBALANCE. ONCE IN CRUISE USED FUEL CONFIG CHECKLIST AND TRIED TO BALANCE FUEL. EVENTUALLY WERE ABLE TO NOTICE THAT FUEL WAS FLOWING FROM L MAIN TANK TO CENTRE TANK AT APPROX 2.6T/HR. AFTER TROUBLESHOOT WITH MOC AND NO SOLUTION, THE DECISION TO DIVERT WAS MADE. AIRCRAFT CHOCKED IN WITH 6.3 L MAIN, 20.8 C TANK, 15.1 R MAIN. RESOLUTION FUELING SHUT OFF VALVE INSTALLATION TEST C/OUT IAW AMM 28-21-02-404-021 SUB-TASK 28-21-02-654-033. (TC# 20190722008)