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You could try making a very thin cut with a razor. Then very carefully inject some glue (you need to experiment), press it around the bubble with your fingers, then heat it with a hair dryer. Then using a vacuum cleaner, suck all the air out (and some glue...)To stop the air getting sucked back into the thin cut, put some tape loosely over it to act as a valve. When the glue has set, pull the tape off. You shouldn't see the cut. I've done it before on other cars and it works.