As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED. UNWANTED FUEL TRANSFER FROM RT MAIN TANK TO CENTER TANK. IN FLIGHT WITH ALL PUMPS ON, RT MAIN DROPS 600-1000 LBS BELOW LT MAIN. TRANSFERS AND BALANCES OK WITH CTR PUMPS OFF. REPLACED RT CTR FUEL PUMP, IAW AMM 28-22-41. OPERATIONS CHECK GOOD.