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I had a bout of sidewall bubbles on some Michellin PS2s on our 993. This was in 2006. Same type of weirdness. America's Tire (Discount Tire) where we purchased them looked at them and told us same as you... But no sign of external damage.
Had a front and rear bubble on opposite sides of the car within a month of each other.
Warranty covered it no problem.
Still unnerving though.
Cooper
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