MissionScript won't work?

base = game.Workspace.SurvivorCount 
missionstxt = script.Parent.missions 
Cash = game.Players.LocalPlayer.leaderstats.EXP
tcb = false
--SurvivorCount Mission (1)
base.S1.Changed:connect(function()
    if base.S1.Value == true and base.S2.Value == true then
            missionstxt.Text = "Mission One Complete!"
    end
end)
base.S2.Changed:connect(function()
    if base.S1.Value == true and base.S2.Value == true then
            missionstxt.Text = "Mission One Complete!"
    end
end)
--EXPcount Mission (2)
if missionstxt.Text == "Mission One Complete!" then 
    missionstxt.Text = "Current Mission: Clear out area."
    tcb = true
end
if tcb == true then
    if Cash.Value >= 1350 then
        missionstxt.Text = "Mission Two Complete!";wait(3);game:GetService("TeleportService"):Teleport(199050234)
    end
end

Why won't this script work? It won't detect if the base's S1 and S2 values are true, and if they are true change the text, then change the text again, detect if the player's leaderstats EXP value is 1350, if it is wait then teleport. I'm not good at explaining this. Any help please?