After reading this blog post calling for the USNS Mercy to be activated and deployed to Haiti, I found some interesting tidbits here on a San Francisco bloggers page: Work on the USNS Mercy, scheduled for drydock work in San Francisco, may have been cancelled and the workers at the drydock laid off. A possible deployment to Haiti was cited as the reason. The USNS MERCY was in drydock in Mission Bay area of San Francisco but the workers were told they were laid off until further notice.
Trying to find more than just a blog post to confirm that.
Here was the original dry docking proposal.