What was found
FLIGHT DIVERTED DUE TO FUEL TRAPPED IN CTR TANK. PERFORMED ECAM UNABLE TO TRANSFER FUEL. INSTALLED MANUEL ACTUATOR VLV & PERFORMED OPERATIONS CHECK OF ACT MANUEL TRANSFER TWICE, CHECKED GOOD IAW AMM 28-28-00-710-001, PERFORM OPERATIONS CHECK OF ACT AUTO TRANSFER IAW AMM 28-28-00710-004, TWICE CHECKED GOOD.