You will likely be forced to manually determine which module is bad. I know of several utilities to test memory, but neither tests specific modules. All tests confirm or deny the presence of bad memory, without saying which memory module is at fault.

The only way I can think of to isolate the bad memory module is to run the test in repetition with only one installed memory module. Conversely, you could run the test repetition after removing one memory module until the test reveals no fault.