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Steven,

These lines won't work, because the second one changes what the first one did, so the lower case is never searched for.

var n = str.search("drain");
var n = str.search("Drain");

The attempt with two separate variables probably works, but these lines change the SL variable to the upper case regardless of which one is found.

player.SetVar("draincoolant", "Drain coolant");
}else if(m >= 0){
player.SetVar("draincoolant", "Drain coolant");
}else{

Try      var str = player.GetVar("draincoolant").toLowerCase(); if you want to ignore case. The problem is that the answer is changed to all lower case, which is only a problem if you come back at the end and reset the SL variable. In that case, I would use strOri to store the original value, then use str = strOri.toLowerCase(); Search str, and use strOri to write to SL.