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Check the blower wheel. When it starts wearing out it wobbles on the
"D" shaft and rumbles. It is a $15 part. Take off the front cover and
the blower manifold cover. The wheel is there on the front of the
motor shaft. You will probably find enough loose change to make it
worth your while.

UNPLUG IT BEFORE YOU START

Your right maybe I should check it out. From what I gather the front cover
screws are accessible by opening the top.