Have a compact refrigeration - Frigidaire MODEL FRC331GM. Out of Warranty. Had a small plastic bag of ice in the freezer compartment. When removed it to clean the fridge, heard a pop. Now, it doesn't cool. I know it's running because the light is on and I can hear a humming. Just won't cool. I have the Use & Care Manual but none of the 'troubleshooting' suggestions work. I'm thinking I need a part. And maybe it's not worth spending the money to repair unless I can do it myself. Any suggestions?