The color change mentioned is often temporary and will return to normal as it cools.
Covering over sheeted areas tend to bubble more and may need to have a small pin poked through to let the air out.
Be carefull around trim, I have found that when heat is applied to area with trim (especially large areas) that the trim will bubble or evn come loose. This is more true with Great Planes ARFs as they use Monocoat which tends to release gas more when heated.
There are times that no matter how much you work at it the wrinkles are just too bad and will never come out.
In that case you will either have to live with it or recover that area.
I had that happen with my Great Planes Super Stearman on all 4 ailerons. I ended up recovering them.