I didnt have instructions but this is what I figured out. I assume you can locate all the obvious screws, there is one more under cord/switch cover. Leave the two long plastic screws in top unless you need the motor brushes and or speed sensor module. no need to remove the handles. You need to remove the three metal screws holding the shaft pinning mechanism. Underneath that cover, look closely, the large washer is actually a threaded spacer. Put a screwdriver through shaft and remove that washer. There are two holes in it for a speccial tool, I used a channel lock. Pry back very top edge of rubber boot and remove the clip holding the spring mechanism (look at a parts diagram for a better understanding what to look for) The only way for me to get the armature loose and separate the casings at this point was moderate but persistent rubber mallet persuasion on the end of the shaft where the collet is. It took several blows but it fianally released and the router was apart. My cooling fan had shifted and was making a scraping sound. I gently budged it into place (lowered it 2mm) and reassembled and I am happy.
Good luck.
IXFE