vmkfstools –D /vmfs/volumes/<UUID>/<VMDIR>/<LOCKEDFILE.xxx>
I was able to get output that had this in it:
Hostname vmkernel: 17:00:38:46.977 cpu1:1033)Lock [type 10c00001 offset 13058048 v 20, hb offset 3499520
Hostname vmkernel: gen 532, mode 1, owner45feb537-9c52009b-e812- 00137266e200 mtime 1174669462]
Therefore the offending Mac address is :00:13:72:66:E2:00
I opened my vSphere client and found the offending nic in my Configuration/Network Adapters by traversing each suspect host.
After rebooting that host, the file lock is gone.
Credit to this article from VMW http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=10051