I hope it's nothing, for safety, check the whole branch, if it has holes, breaks, mold. However up to now you have done an excellent job, if there are no particular signs you can consider the yellow leaves as a physiological sign of age and the need for a larger pot. Maybe this is the moment for bloom nutes, Bro. My Pineapple Kush also has only two branches where the K deficiency is much more evident. Strange. Protect it from the rain. This is the most beautiful phase π
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