X is not a valid member of part. Am I doing it wrong?

local part = script.Parent.Parent.FoxSeat
local i = 1
local model = script.Parent.Parent
local plat = model.platform
local Pointa = model.pointA
local Pointb = model.pointB
local bodyPos = plat.BodyPosition
local time = 6.5 --Time between motion


while true do
    bodyPos.position = Pointa.Position
    wait(0.1)
    if bodyPos.position == Pointa.position then
    for i = 1,180 do
wait(0.1)
    part = Vector3.new(part.X +1, part.Y, part.Z)
wait(time)
    bodyPos.position = Pointb.Position
    wait(0.1)
    if bodyPos.position == Pointb.position then
    for i = 1,180 do
wait(0.1)
    part = Vector3.new(part.X +1, part.Y, part.Z)
wait(time)
                end
            end
        end
    end
end


local i = 1