If you click on the heater's (Item 12 in Section 4) picture a new page wil open withe Q&A section.
The third question down has info on this type of problem.
To repair the hole in the freezer line go to Home Depot etc. and get some duct tape. It is silver foil with a peel and stick backing (not the fiber type).
Also check that it has not melted the insulation behind the hole.