Sean
Just replace heat tape last fall, er13, it's not a bad job but takes an hour or two!
I have down loaded the maintenance manual and parts list off the Domectic website for the model 1402 and was a great help.
Got the heat stripe from PPL, about $90 bucks.
I also found that the flex tube that goes into the refrig side did not have big enough hole at the end to let the water drain from the freezer side.
Hope this helps
Mark Bryant