Sounds like the part they are sending me resolves the issue where the wood chip tray could be inserted incorrectly and cause a flare up and also increases the size of the chip tray. I did not think this issue was in the 312/512 and only the gen1/311 (An old Issue). I don't think I need the part for my 512 but they are sending it any and I don't think it has any affect on air flow but will update when I receive the part this week with a photo of the part. Sounds like the pre-assembled units have the correct tray and larger loader. I guess some of the earlier versions must have required assembly of this section. What the hay do I know? Very little just ask my wife... I had not seen this notice before and just found it on a search. Funny that I could not find it anywhere on the BassPro web site, It did show up on Sams/Walmart site but ya got to go deep for it. These kinds of things should be mailed direct to the buyer ya would think. Maybe they were? MasterBuilt Digital Electric Smokehouse Product Safety Notice Models:20070312, 20070512 Bass Pro SKU# 1856727, 1856728 Improper placement of wood chip tray may cause potential flare up. Call Masterbuilt toll free at: 1-800-489-1581 to recieve free replacement wood chip housing Masterbuilt has become aware of a situation where the wood chip tray can be inserted into the wood chip box incorrectly, causing a potentially unsafe condition. A modified wood chip box is available, and can be shipped to you at no charge. Please discontinue use of your smoker and follow the contact information below. Once you have received the modified wood chip box and installed it, you will be ready to continue use of your smoker. Thank you for your purchase and Masterbuilt apologizes for the inconvenience. You should contact Masterbuilt Customer Service immediately for assistance. Via phone: 800.489.1581 Monday thru Friday 8am to 5pm (EST) Via Email: [email protected] When contacting us via email please include your name, complete shipping address, model number and contact phone number.