I did watch a Youtube vid of a guy "resetting" a neck w/o removing it.
He said that often times when some might think a neck has to be removed to reset it you can just correct the depression the fingerboard has made in the top. I'm not stating this very well and I don't know how to ad the youtube link but I searched Youtube for the cost of resetting a neck and it came up. YouTube,
https://youtu.be/UTVzGM1Znv8. John Miner.
He braced the top of the neck to keep it flat, stuffed 95% of the interior of the guitar with rags to keep steam from loosening the interior bracing, steamed inside on both sides and close to the neck block, put some downward pressure on the nut (removed) end of the neck which put upward pressure on the fingerboard/top of the guitar to over compensate for some of the defect, steamed it a couple more times and let it sit for 3 weeks.
It made pretty good sense to me but this method was probably for minimal correction.