Oh. Well, new ailerons are easy to make. But same technique applies. You only need one person though. Wear hot gloves and hold it over steaming water. Twist farther than you think you need to because it will spring back a little. Hold it until it cools.

There are ways to build jigs to hold the aileron while you take a heat gun to it but it requires that the jig is very accurate. Basically you cut three or four pieces of balsa from a sheet and pin them exactly vertical to the board so you can lay a straightedge across them all and it touches each of the four. Pin the aileron to it and apply heat. Let it cool, turn it over and do it again. Keep doing that as necessary and then leave it pinned to the jig until you need it again. Sometimes it works and sometimes it doesn't.

But ailerons are usually flexible enough that you can remove warps by shrinking the covering while having a helper hold the aileron with the warp taken out while you shrink the covering.

Again, making new ailerons is easy, so if it takes too much effort to fix this one, just make new ones.