I just finished fixing audio in episode 28 and it's on the way, everyone should have it within a minute or two. And that concludes our season 5 transfer. I hope everyone was able to get all the episodes and they play on your devices without any problems.
One note re. episode 28, though - I'm afraid by fixing the audio (from 00.13.40 onwards) I made the quality of the video of the rest of the episode worse as it went through an additional 2 conversions.
It's still watchable and the audio is now fine (with a noticeable and unavoidable glitch at the beginning of that segment), so consider it an extra you can use to watch the episode without getting annoyed by the sync problem. But I'd keep the original out-of-sync file if you want the HD picture (even though, as Matthew noted, it's most likely worse than the original 4.8 GB Amazon file).
If anyone can do a better job fixing the audio and keeping the picture quality - knock yourself out, but I'll be at this point crossing season 5 off my to-do list.
Thanks to Phil Colby again for alerting me to this and starting this whole process.