Maybe using a professional grade heat gun and being a professional using it ok but very few here are professionals when it comes to this and a heat gun used by one who does't do this for a living could be costly. For most here use a hair dryer be smart. No where in my original comment said anything about pro's not knowing what they were doing I was simply stating play it safe.
Mine has done this every year.
New bubbles in different places.
Nothing like the number in the OPs photo but annoying.
Oddly it's only on the sunny side, south facing side as it sits at our home.
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