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You can't determine display option from the Ser number... To confirm what you probaly already know..All 3 are SXGA VAD displays...
324 = LE1700 SXGA+ View Anywhere Display
371 = Ditto
267 =...

Look for M icon it may be hidden.
Right Click on it and select Options
Select Show Hadrive Activity
Icon will now blink & show HDD activity.

Also, remove the left battery. Orientation batteries...

One piece of advice regarding the SSD upgrade procedure video.... Remove the Battery(ies)!!!!! Before you dive into the device..... Paul