My home A/C Carrier brand outside unit fan is squealing. It is
probably 15 years old but I don't know for sure since I've lived here
for seven years and the house was built in 1990. When I bang on the
cover it goes away for a while.

Is this something I can remove and grease the bearings or is it a
sealed unit and not worth fixing?

If I call a repairman what should I expect pricewise?

If this is repairable any advice would be welcome. Thanks.

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No matter what happens someone will find a way to take it too seriously.