It would appear that yiur leaves could possibly have had some water standing in them and then recieved too much light. This water will act like a prism and accentuate the damage caused by the light. This in turn can cause brown rot on the leaves to occur. My suggestion is to quarantine the plant and remove the damaged leaves as well as treat the plant with Physan or some other fungicide/bacteriacide type solution. Also sprinkle cinnamon ont eh cut areas after removing the leaves. Good Luck!
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