Discovered a crack in the fuselage tubing of my T-6 near the lower left hand engine mount attach point:
Didn't appear to be accident related, but caused by a weld defect from when the bracket was originally welded into place. Over time the flaw grew to about halfway around the tube. I'm glad I took the firewall off to straighten it out a bit and do a little inspection and corrosion control.
This airplane has never flown in civilian hands, so this has been cracked for at least 40 years.
Anyhow, here it is a few weeks later after the tubing was spliced. I'm not a very good welder, so I had a pro do the work. Here is the result: