If you locate a resistor that appears to connected to the fet.. measure the original resistance value.. then pencil down a small amount and boot to check for change.
oem R = 1.38ohms
pencil R = 1.28-1.35ohms
..You should be able to see some change within the first few ohms of the original value..
*you can pencil while running.. just be careful when measuring at the fet again for voltage.. best to unplug HDD and externals and just sit in BIOS or at DOS screen when doing the above "live"