Here's a link to the recall order.
Tanks referenced in the order appear be those marked as DOT-SP 14562, DOT-SP 13957, or DOT-SP 13105, which include the 10 lbs, 20 lbs, 25 lbs, and 33 lbs tanks.
I have also attached a photo of the tank that was most commonly sold to boaters.
In the order is a description of the models that are effected. Please check your tank immediately to see if it is one of them. (I'll post that here shortly.)
If so, stop using the tank NOW. In the order you'll see that their manufacturing process and testing practices were called into question in later years, and there is a small but significant failure rate in the smaller tank sizes.
The manufacturer promptly closed their doors when the recall was announced so I'm not sure that sending the tank back to them will accomplish much. It could come back to you.
I am not a lawyer, or a recall or gas expert but if I owned one of these tanks I would take it a propane dealer, have it drained, then disable or destroy it so it can't hold propane.
We'll continue digging into this and post more information as it comes up.