Harman FS accentra, vibration and humming

[missrobo]

My accentra is five years old, other than a past ignition problem it runs trouble free, until this year. Since starting it this fall it has developed a loud hum and a definite vibration. The noise and vibration begin when the combustion blower comes on with start up ( the red light is on for the combustion-blower). Today I checked the fins on the fan and they are not bent and the area is clean. Could I need a new combustion motor? Any help would be appreciated. Thanks

 

[Bioburner]

Could be a bearing going out.

 

[missrobo]

Could be a bearing going out.[/quote
I know this is going to sound stupid, but where is the bearing and is it easy to replace?

 

[Bioburner]

Someone may chime in as to if the fan may be oiled or the unit needs to be replaced. Fan replacement may be available from Graingers or other sources for a savings. If you take it out and take some pics others may get you some good advice as to repair or replace. Good luck