Finally made time to tear down the stove to do a deep cleaning and to replace that rattling versa grate gear box/motor. St. Croix had sent me a new one under the warranty. Kept the stove under a vacuum with the leaf blower and used my compressor with the air nozzle to clean those hard to reach places. Noticed I got a lot more ash out of the stove that cannot be reached with a brush or the vacuum cleaner. Especially behind the those firebox void covers, ash traps, and the heat exchanger tubes. Pulled the combustion and convection fans and chased the entire vent system from the fire box to the outlet. Cleaned out the intake (nothing much there) and the vacuum switch fitting/tubing. Also removed all of the versa grate linkage, cleaned and lubricated the bushings and cam. Darn thing runs quieter than ever. Next project is to pull that old gear box apart, clean it up, give it a close inspection and then repack it with lube. No sense disposing of it, it still worked fine, just drove me nuts with the chatter. Hopefully this might fix the problem and I will have a spare motor available if the new one fails. Stove is breathing "happily".