Propane Tank Replacement

Propane tanks have to be recertified after 12 years and every 5 years thereafter.

http://www.propane101.com/propanecylinders.htm

Has anyone ever had a propane tank recertified? Has anyone ever had a propane tank not pass recertification?

If you have a 1999 or earlier TM, this may be a concern especially with the expensive horizontal propane tanks.