It's so loud and high pitched that it's painful to use the blower, even with
my reduced hearing.  But, as I continue to, it's becoming less frequent.  Do
these things ever fix themselves?  It's probably  dry bearing or worn
commutator/brushes, but with only 140k on it (an '85) it doesn't seem like
it should be worn out since my '84 worked fine for 20 years and 225k.

I'm tempted to shoot some WD-40 into the intake, but I'd probably regret it.

Stuart