Somebody soaking their BP doesn't necessarily mean they suspect something is wrong. Lots of people who aren't entirely knowledgeable about snake/BP husbandry soak because they are lead to believe it is necessary as normal maintanence, or because the snake is going into shed. Not saying it is the right thing to do, just that to the general public, and even to plenty of people who spend time on this forum, soaking their snake is thought to be an acceptable/normal thing to do.
The light yellow spots on the belly look normal to me, as far as the range of BP markings go. It never hurts to have a qualified vet take a look to be safe, but I don't think the snake's belly looks unhealthy, just strangely marked, with the dark banding and colors extending across.
Fila - Keep an eye on the belly, and read up on scale rot. If you notice it changing in any way, definitely have it looked at, and make sure the bedding/substrate isn't too moist, but it doesn't immediately pop out to me as something to be worried about now. Some of the marks where the dark banding cross over the belly almost make it look like healed burns, but I honestly can't tell from the picture whether the scales are the normal size/shape of a clear bellied BP and they look distorted from the banding, or if they're actually disfigured. You can probably tell a bit better as you can look at her first hand =) From the picture, they appear to be healthy.