Ok, I actually USED a Hasselblad 1000F for a number of years and know a lot about them. First, it was a VERY reliable camera if it was properly maintained. It needs a CLA every 3 to 5 years depending on use. Secondly, the first Hasselblad - the 1600F - did have problems and all were fixed in the second model - the 1000F. The 1600F/1000F uses a different lens mount than the 500 & 2000 series cameras.
I had a number of photographs published by the Hasselblad house magazine that I took with the 1000F.
In 1977 I sent my 1000F back to the factory for service and it came back like new. However, the factory has long stopped servicing the 1600 & 1000F cameras. The ONLY person I would send a 1000F to is:
David Knapman
Pro-Camerara Service
Box 115
S-438 23 Landvetter
SWEDEN
Phone: +46-31-919403
knapman@tele2.se
David worked at the Hasselblad factory and bought all the 1000F tools and parts that the factory had left many years ago. I do not know if David is still repairing them - best to contact him first. 5 years ago he had a HUGE backlog of 1000F cameras to service. If your camera only needs a CLA it can be fixed. If it needs a few parts it may or may not be repairable - David will have to strip it down to see.
If it was my camera I would contact David and see if he is taking in any work.
I currently use two Hasselblad 2000FC/M cameras that also have focal plane shutters. For more info on the Hasselblad focal plane shuttered cameras see my web page on them:
http://www.oresteen.com/hasselbladfcameras.htm
Good luck!