Direct quote from Vid regarding this exact scenario.
Quoted from vid1900:Take a sharp, brand new straight-pin.
Don't even make a **hole**, just with the tip of the pin, let the air out.
About 5% of the time, the Mylar will still have enough stickiness to re-adhere when warmed with a hair dryer, but don't count on it (especially on a game that old).
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NEVER inject superglue or poly under the Mylar!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Thanks
Blake