Hello
That CB1200 is a super stove. The exhaust blower is the first thing to go so that is good!
I would check the room blower to make sure all the dust is cleaned out of both ends of the squirrel cages. Pull the Thermocouple cover off and make sure the wires are twisted and there is a drop of slag at the end from a good spot weld. If the thermocouple cover cannot be cleaned very white you may want to get a new one. I would clean it up real nice and if the paint is faded you can re paint it easily with Stove Bright Satin Black spray paint. I also like painting the grill with VHT very high temp 2000 Deg Flat Aluminum header paint you can get at the auto parts store for a little PiZaz!
Also check the fire pot ash dump rod to see if it pulls out easily and snaps right back if you let go. If not spray PB Blaster on the linkage after wire brushing any rust or corrosion off it. Then wire brush the bottom of the fire pot and then spray it with Dry Moly for a nice and easy pull.
Good luck and let us know if you have anymore questions but we like to see pics of it of course!