Unless you buy the exact replacement board, you need a bit of board of sorts from a DIY outlet. Then a kindly neighbour with a jigsaw. If you dont want the shaped top, any decent saw - electric or otherwise.
It's quite easy to make an identical headboard by using the existing one as a pattern. The headboard is placed on top of the new plywood face down then with a 2H pencil draw around the perimeter which includes the large radius profile at the top so no measuring involved. You can buy a cheap hand saw for under a fiver just to cut the new headboard but you will need a sheet of medium grade sandpaper to remove the rough edges either side. For a final professional finish just apply a light coloured stain then varnish with about 3 coats of varnish, sanding each dry coat with a very smooth grade of sandpaper and wiping over with white spirit.
We had the same thing happen in our Lunar but fortunately it was in warranty so was replaced. We made an extra piece of wood that fits underneath to add strength.
------------- Jean
Sometimes a little rain must fall before you reach a rainbow.
The work will wait while you show the child the rainbow, but the rainbow won't wait while you finish the work.