When you say a blockage, you’re referring to build up from food particles falling and covering the holes of the fingers, correct? If so, all fingers have been thoroughly cleaned and back in their correct spots.
My thought would be temperature control but it seems one side cooks fine and the outside where the window is cooks harder. If it were temperature control I’d think it would cook dark on the entire belt, not just a section
there is a baffle up in the finger that is used to balance the airflow between the back side of the oven and the side nearest the door, I can’t lay my hands on my manual right now. I think Lincoln has these manuals available online. They are basically a tab up in there that is tweaked to direct more air one way or the other on initial set up.
I believe I found the problem. When I took it apart this morning I switched the fingers between the two ovens to try to eliminate any problem with the temperature control and focus on the fingers. When I took the covers off of the fingers to look at the inserts I noticed a slight bend in one of the fingers. About 3/4 the way down the finger (finishing pattern) there is a piece of metal about 3/4” to an inch high. It was bent and allowing more heat to 2 holes (only about 1/4 of the hole) however, bending this back straight seems to have fixed the problem.
Well just when i thought it was the fingers it ends up it wasn’t. Turns out the cheese we’ve been using had been cheapened. Switched cheeses and now everything is back to normal. Good grief, tried everything but the cheese [emoji849]