typedef struct _WHEA_PCIEXPRESS_ERROR
{
     UINT64 ValidationBits;
     PCI_EXPRESS_DEVICE_TYPE PortType;
     ULONG Version;
     ULONG CommandStatus;
     ULONG Reserved;
     PCIE_DEVICE_ID DeviceId;
     UINT64 DeviceSN;
     ULONG BridgeCtrlSts;
     UCHAR ExpressCapability[60];
     UCHAR AerInfo[96];
} WHEA_PCIEXPRESS_ERROR, *PWHEA_PCIEXPRESS_ERROR;

Windows Vista Kernel Structures