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What direction does the roof slope face? West or south facing with lots of sun can deteriorate the rubber on the vent stack flashing faster than the shingles. Is it leaking? Or does it just look bad? If it is leaking, you can do a temporary fix around the top of the boot collar with roofing tar...the stuff that comes in a caulk tube. Keep it inside until you head up on the roof. Warm tar will flow out of the tube better than cold. And get the stuff that can be applied in wet or dry conditions. Then when the weather warms up, replace the whole boot. You will need to R/R some shingles for this. Good luck.
Dave
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