Mine is definitely a 20070311, and the element is replaceable. A pain in the rear, but replaceable.
My issue (see above) was the connectors which slide over the element tabs having crumbled, so I really had not planned to replace the element. When Masterbuilt included a new one with the other wiring parts, I decided to go ahead and replace everything.
It's a darn good thing I did that, because while removing the old element, BOTH tabs broke off. They were as rotten as the connectors and would not have lasted much longer. All well now, heats like a champ.
Good! I just put a post on the "Problems with MES" thread if I should go in and put dielectric grease on the joints that failed on yours before mine corrode/oxidizes. Maybe checking the tightness of the flag connectors yearly would eliminate resistance/heat/oxidation to keep the inferior OEM parts from failing.