im not a pro but i did something with my bass that worked but took about 3 weeks. my way might damage your guitar but it works if your not too concered about value.
i took three blocks of wood 2x4s, a long 2x4, and a huge c-clamp (10 inch i think). i put the neck in the blocks and centered it around where the most extream part of the bend was. every day i sprayed the fingerboard down heavily (dripping) with warm water in a spray bottle. the id give it about an hour and tighen up the c clamp no more than a quarter turn a day until i had a small forward bend. then i let it sit for 2 days with no water and no tightening before i removed the clamps.
this makes the wood in the fingerboard swell and ass you tighten up it helps things go back right. after your done get some lemon oil or mineral oil (what ever you want to use) and clean ith up and make sure the neck gets all it can take (it will be very dry after all that water).
i could be wrong and it hasnt been that long so i dont know if the bow will come back and i dont know if this is even anygood for a guitar opr bass but it worked for me.