Hi first freezer did not freze probably, now freezer is fine but mow fridge is warm???
Here are your parts
http://www.appliancepartspros.com/partsearch/modelsearch.aspx?model=HTS18GBSARWW
it is hard to tell if the freezer is actually OK. It should be between 0 and 5 degrees F. The fresh food should be around 40 degrees F.
Is the evaporator/freezer fan running? It is required to push cold air into the fresh food section.
Is the damper in the freezer adjusted to be open?
Is the compressor cycling or on all the time, other than during a defrost cycle?
Is the condenser/compressor fan running and are the condenser coils clean?
If on all the time you probably have a defrost problem or a sealed system problem.
Remove the cover in the freezer so you can inspect the evaporator coils.
If heavily frosted/iced up you have a defrost problem.
If there is just frost in one area (usually where the freon enters the coils), you have a sealed system problem.