No Audio when importing to FCP
Importing from a Canon XHA1 digital tape the audio (on a single track) is missing. It is a full 63 minute tape and the audio stopped after 14 minutes. I tried several recommended actions such as altering the preferences - including 'remove silent channels' on and off, (which wasn't ticked ) restated Final Cut, tried Movie, restarted my Mac all to no avail.
I then tried reloading the video that had worked correctly, as a test - the first 14 minutes - and that now also does not have audio with it. So it worked fine to start with and now doesn't what is the problem and how to solve it please?
The file is a digital copy from an old video 8 analogue tape.
iMac with Retina 5K display, macOS 10.14