Unit installation says 15" from heat source. Well as you probably know your pan just closed that gap and your trim is warped or burned and or cracked and brittle from the heat. my suggestion is to run that fan at all times when you cook with a larger pan.
will need a long phillips #2 (9"+shaft). 3 screws fasten this part. the middle screw is directly behind "PUSH" area. you may be able to remove the outer 2 by way of grease filter holes (and yes remove filters). but save yourself the trouble and remove extension tray completely. (1) 2 screws on each side of tray (remove) fasten it to extension rails. (2) i used a cardboard box to support the assembly (no room for second person) metal spring coil on each side. remove one side at a time pay attention to the orientation and be cautious (sharp). straighten, but don't kink until the end (unattached) nearest you comes of the roller. I rolled it back on itself and hooked it to the unit near attachment. remember to maintain the attached end in its original position if it spins. that odd flex is what retracts the tray. I (3) the tray tray should be free, be careful not to strip screws holding part, and be careful not to break part re inserting screws (cheap plastic, that is why we are replacing.) also, everything will be greasy, so plenty of cleaner and cloth. CHEERS