Evaporator fan replacement

I cannot figure out how to pull out the freezer bottom to acces the evaporator fan, there are no screws or clips visable…anyone know the trick? I see the part is available so I assume it is serviceable but this has me stumped.

This is on a boat so I cannot get a qualified GE repair person to work on it, although it is free standing. I had a marine refridgeration person look but he did not know how to remove the panel either.

Can anyone assist is letting me know this trick:)