Hardest part of this job was getting the coils completely defrosted so that I could remove the "Twin Cooling" plastic cover.
After removing the cover, used a blow dryer on low heat to melt any remaining ice. Then, I removed the lower back cover to access the defroster drains and poured hot tap water into the inside drain (at the bottom of the coil unit) until it flowed freely out of the bottom drain.
Disconnected the coil defroster electric connections, then used a flat blade screwdriver to gently pry the aluminum tabs away from the old defroster element (take lots of pictures first, so that you can reinstall new coil in the same orientation).
Installed the new defroster coil and resecured by gently pushing the aluminum tabs around the new coil element.
Re-connected all electrical connections and re-installed the twin cooling cover.
So far, so good. Will watch to make sure ice does not re-form at the vent holes in the cooling cover. If it does, goodbye Samsung...I will have learned my lesson.