Need help, outside freezer not staying very cold.

Noticed yesterday afternoon that there was a small puddle under the freezer but it was so small that I thought it just came from the rain. Well this evening I went to get some food out and I noticed that the vegetables didnt seem as frozen as normal. So then I checked some other things and those too werent as cold.

Its a frigidaire frost free upright freezer. Dont have any idea what I could even test on it as I know nothing about freezer maintenance. When I pulled the freezer away from the wall I noticed that it had some R134a stickers on it so am I supposed to add freon to it every so many years? When I open the freezer the light comes on and you can also hear that the freezer is definitely on.

Id appreciate any help I can get on this.