When you run EPST to update your PRL, it should automatically find it for you when you click browse. (Or at least it does on my apache and I had the PRL file saved to my storage card.)
If you need your MSL # try using
GetSPC (you enter your ESN and it spits out your MSL)
Hope this information was useful
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Sprint Affiliate Sr. Technology Specialist
Current Devices: Sprint HTC Hero (Advocate Phone), Sprint Touch Pro 2 (Personal)
Previous Devices: Sprint Touch Pro, Verizon VX6800, Sprint PPC-6800, Sprint BlackBerry 8330, Sprint Centro, Sprint PPC-6700, Alltel PPC-6700, XDA Orbit, Sprint Treo 700p