Why is this not working? the value doesn't go up but it prints check...

I'm confused why it's still not working the problem is the value doesn't go up but the stuff gets printed... like it says check for the print"check")

local v = game.Lighting:WaitForChild("ONE")
local sway = math.random(1, 100) * math.random(0.05, 0.15)
local y = math.random(1,10)
local x = math.random(1,1)
while wait() do
y=math.random(1,10)
wait(15)

print("Changing Values...")
v.Value = v.Value + sway

if y == 5 then
    v.Value = v.Value * 1.1 * math.random(1.7, 2.1)
    print("Multiplied ONE")
    elseif y == 6 then 
        v.Value = v.Value - v.Value + 2.50
        print("ONE just crashed!!!")
        elseif y == 6 then 
        v.Value = v.Value + sway
        print("check")
        elseif y == 7 then 
    v.Value = v.Value + sway
        print("check")
        elseif y == 8 then 
    v.Value = v.Value + sway
    print("check")
        elseif y == 9 then 
    v.Value = v.Value + sway
    print("check")
        elseif y == 10 then 
    v.Value = v.Value + sway
    print("check")
        elseif y == 4 then 
    v.Value = v.Value + sway
    print("check")
        elseif y == 3 then 
    v.Value = v.Value + sway
    print("check")
        elseif y == 2 then 
    v.Value = v.Value + sway
    print("check")
        elseif y == 1 then 
    v.Value = v.Value + sway
    print("check")
end
end