Replacing a dead Readynas NV+ to recover data from drives? #27492351

  I just witneessed my Readynas die after many years of good service.  I noticed a strange burning smell and right when I realized it was coming from the area the Readynas was in I saw the lights flicker off and it stopped operating.  Either the power supply or the board in the chassis has burned out and the unit no longer powers on.  I was able to pull the hard drives out and I'm not seeing any burn marks or signs of damage on the drives.  

  I really don't want to lose the data and just want to confirm that if I buy a replacement chassis and stick the drives in, in the same order will it be able to boot up and see my data if the hard drives are still working?  Are there any special steps?  Does the firmware need to be updated to match my previous chassis before booting with the drives in?  I can't spend much money now, but is a newer chassis even an option for recovering the data?  It is definitely an older piece of equipment now so if I can find a newer chassis in the same price range I would consider it, but accessing the data is my primary concern so I'll be looking for another Readynas NV+ chassis if that's my only option for saving the array.  I remember I chose the Xraid format when I first set the device up if that matters.