What was found
RIGHT SIDE FUEL BURNING MUCH FASTER THAN LEFT SIDE. IN 2:30 FLT TIME, FUEL IMBALANCE BECAME GREATER THAN 300 LBS AND CAUSED A FUEL IMBALANCE ECAM WARNING. AT THAT TIME, THE XFEED VALVE INDICATED CLOSED. CROSSFEED VALVE FAILED OPEN. ECAM AND PB SWITCH BOTH SHOWED VALVE CLOSED. REMOVED AND REPLACED DEFUEL/CROSSFEED VALVE ASSEMBLY PER AMM 28-25-43.