APHA Registration question

I recently went and looked at an APHA breeding stock mare for sale and when I looked under her belly she had two white patches. As far as I know this makes her a regular paint and not breeding stock but the owner said they could not see the spots when she was a baby and therefore registered her as a solid. What would I have to do to get her registered as a regular paint if I did get her?

The white (or contrasting color) must be present at the time of birth.

APHA Rule RG-070. Color Requirements
B. For the purpose of this rule, the term “natural Paint marking” shall mean
A predominant hair coat color with at least one contrasting area of solid
White hair of the required size with some underlying unpigmented skin
Present on the horse at the time of its birth. This solid white area must
Be in the prescribed zone depicted in the illustration below. In the event
The horse has a predominantly white hair coat, the term “natural Paint
Marking” shall mean at least one contrasting area of the required size of
Colored hair with some underlying pigmented skin present on the horse
At the time of its birth. This colored area must be in the prescribed zone
Depicted in the illustration below.

She had the white markings at birth he just didnt notice until after he sent the papers in since they were under her stomach.

I think you'll need to call the APHA and ask about it. I don't see anything in the rules relating to changing the registration.