I think I might have something similar to this as within the last month my clutch pedal started squeaking. I've had someone press the clutch and checked from the outside and the noise is definitely inside the care somewhere. I then shot some white lithium grease over all the moving pedal parts I could see including the piston going through the firewall (now the car smells lovely inside). The grease just didn't seem to do anything to it. I read a number of posts where it's common for the clutch slave to be noisy but what about the clutch master, could it be the source? How can I tell if its the welds, from under the dash the several welds I see on the firewall plate look OK even when the clutch is pressed. I did notice that when the clutch was pressed in the clutch master seemed to 'flex' a little ever so slightly. If this is a cracked weld issue does SOA cover this under a recall or the like? My 2008 has like 52k on it.
Thanks guys for the feedback.