About three days ago I noticed that one of the blowers (not sure which one) is making a whining sound that it wasn't making before. The whine increases as I increase the heat setting but that still doesn't tell me which blower is making the noise because the Empress doesn't have a separate control for either blower. I was going to pull the side panel and lubricate both blowers motors, but the owner's manual says "DO NOT lubricate the motors." It does say to turn the stove off and vacuum the dust out of both motors. Is that likely to solve the whining or is it more likely to be dust or ash in one of the blowers? I'm just trying to get an idea of where to start so I don't have to have the stove turned off for any longer than necessary. My wife is camped out in front of it right now so I'll have to wait until tomorrow to do any work on it, anyway.