I would suggest to anyone that has a concern about their uke that has the dip or bulging behind the bridge, get it looked at by a luthier who knows their stuff. It may be fine, it may not, but don't just go on internet hearsay.
This is sound advice! I think though, that I will just wait and see. Don't fix it if it ain't broken. There are not many real luthiers around here who know something about ukuleles and those who are repairing guitars depend on earnings. Risk is, they would rather fix something where there is no real issue than let me go with a sunken top. I am much more confident to your experience, folks! So, thanks again for that!