I suggest that instead to replacing the cooling blower, you should clean the dust that probably has accumulate over the time. You should use a bottle with compressed air to clean the blower. You may insert the nozzle trough the air inlets openings, however, much better results you will get after removing the board and dissembling the blower. Any way, if you are intending to replace it, you should know how to remove board. I worst case, you may see the Blower P/N and search for replacement on net.
