Old Voicemail greeting

Hello, I have read another post very similar to my situation and hope you can help. My mother has an old Bell South digital answering system Model 1184. My brother recently passed away. He was the one who originally set up the answer machine greeting. We briefly lost power and the machine defaulted to the automated recorded greeting. I have tried to find the user guide at home as well as online. We are hoping to be able to retrieve the original message. Can you offer any help with this? Thank you in advance.