VRC GP-40 Repaint Issues

So I'm attempting to repaint VRC's GP40-2 CSX primary pack, there is something wrong where only some parts are painted while the rest are in default CSX colors. i cant add attachments because I'm still new or i would show it to you. Anyone know how to fix it? i also talked to someone from VRC, he stated that there are at least 4 texture files or something like that. here is the email he sent me:
I painted the gp402.TgPcDx and thats about it. the other files are indecipherable. Help please.
If I remember correctly, the model has three or four different texture sheets. I think all of them have some pieces of the exterior painted on them, but the first texture deals mainly with outside. That being said, the model is broken down into three different parts - "A" which contains the trucks, cab, start door, and anything that ia animated, "B" which is any part of the model that is seen from both outside and the cab view, and Cab, which is the interior view. It looks like you have only been painting the "A" shape and first texture.
I painted the gp402.TgPcDx and thats about it. the other files are indecipherable. Help please.