I called two of Nikon's authorized repair centers in Illinois. One said it'd cost 150.00. The other said 116.00. I called another repair center in Kansas and the guy laughed and said it took him two days of labor to fix the last FM shutter he got into. He said one curtain is slow or fast in regards to the other, but you have to get all the way into the camera to service it. He told me to just go to KEH and buy one of their EX condition FMs and be done with it
I may see if KEH wants to take this one in on trade.