Remove the 7 screws from the bottom panel using a Philips-head screwdriver. Then, remove the main brush/roller and set it aside.
Remove the single screw securing the spinning side brush in place.
Remove the battery and its 4-pin connector and set it aside.
Remove the 12 recessed screws from the bottom of the assembly.
Remove the 4 screws from the bottom brush assembly.
Remove the 4 bottom screws.
Remove the 3 screws from each wheel assembly and set the wheels aside.
Remove the 3 screws securing the spinning brush assembly. Then, remove the single screw hiding beneath the brush assembly like a coward.
Remove the last remaining screw that's hiding beneath a white sticker beneath the battery component.
Remove the small 8 screws from the bumper assembly. Then, remove the two plastic bumper pieces and set them aside.
Remove the bottom caster wheel by pulling it upwards with your fingers.
Using your hands, carefully pry the top front button panel off.
Remove the 6 hinge screws and then lift the top door off.
Remove the 3 rubber screw covers and then remove the screws contained beneath. Then, remove the 2 screws from the top of the LIDAR cover.
Then, set the LIDAR cover aside.
Remove the 4 LIDAR assembly screws and lift the assembly out.
Now that all the screws are removed, the top panel should slide off effortlessly. If it doesn't, you've missed a screw.
Remove the connector and 2 screws securing the fan assembly. If the new assembly has no metal screen, carefully pry off and transfer the metal screen from the old one to the new one.
Then, install the new assembly in its place.
As usual, reassembly is the reverse of disassembly!