So kinda simple fix for me. I found out that my premiere pro had no .cfa file of the .wmv that had no sound displayed. So I just made a copy of the original .wmv on my desktop and renamed it. Sound’s back. I thought to check this because it was a problem I had a while ago when I was trying to save on a storage drive. Seems like Premiere has problems with instance names.
Go to search on your computer and look up ‘media cache files’ as a folder. Find the name of your project and check to see if your .cfa is listed.