Have been reading this forum for awhile now, but first time asking question. I have a Breckwell P23I insert that is about 5 years old. Had to replace bearings on combustion fan because of excess noise. Put fan back together and put back in stove. Turned on stove, fire lit but now the air adjustment is not working. From no air to full air there is very little difference. Took out fan to make sure everything was put together correctly. Gave stove a thorough cleaning. Check fan RPM, tacked at 3400. Can't think of anything else it can be. Air was working fine before taking out fan. Everything looks good but just not moving much through combustion fan. I'm baffled? Any suggestions??