I've come up against a problem I've been unable to solve, and based on my 2 days of Binging around, I've yet to find a solution to fix the problem the same with a slew of others. I've got several files in a couple document libraries in a MOSS 2007 site collection that are locked by someone when they no longer have the file checked out. This is preventing others from updating the file or deleting it and replacing it.

SharePoint Manager shows it is checked out by a user and the short term lock on the file is always changing. It will say it is set to expire on 8/8/12 11:00 PM then coming in this morning when the lock should hgave expired, it is extended to 1:05 pm today. This has been going on for several days.

* I've tried taking ownership of the file - this failes as the item doesn't show as being check out.
* I've tried to delete it in SPD as some posts reference - doesn't work, and says it's checked out
* I've tried checking it out and checking it in via content and structure, fails to release the lock.
* We've had the user check the document out and check it back it, this has not cleared the lock.

Is there something that can be done to clear this file lock? These are critical documents being affected by this. Can Powershell clear those values so the file can be edited?