PCIE_PERST_B, the Integrated Endpoint block reset signal, is pulled up to 3.3V through a 4.7 kilohm resistor. According to the PCIE Card Electromechanical Specification, leakage current for the PCI PERST# pin should be in the range of -10 uA to +10 uA only.
If you are concerned about this setup, you can replace the pull-up resistor on your ML605 to a value that keeps the leakage current in the desirable range. A pull-up resistor of 392 kilohm, in a 0402 package, to 3.3Vshould ensure that the leakage current does not violate the specification.