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Find the location of the "Cache" folder:
Delete the folders "Media Cache", "Media Cache Files", and especially "Peak Files", go to where the video is and note that there are no .cfa and .pek files, if you find them delete them.
If the problem persists move the project folder and files to another location, if possible to another disk.
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If you are on an earlier version of the Mac OS, you might not be able to get that audio working. I think it takes a recent Mac OS or Win10 to get OS level support for the Dolby AC3 audio codec.
Did you solve this issue yet? If not, please look for the update for Premiere Pro coming very, very, soon--then update.