No audio on recording. Is there a way to get it back?

[Michelle_Argast]

I have a unique situation. We are a funeral home and sometimes record the services for families who can not join in person. We have one recording, where there is no sound, and we dont know what happend that day. We have no issues any other time. Is there a way to get the sound back from the video or audio file. We feel so bad and want to do right by the family.