Carrier furnace - hum from the blower motor when the furnace is off

[Bobhh]

Model Number

396GAW60150

Age

More than 10 years

Hi, new here. I have an older carrier furnace that seems to work fine but I just noticed a hum from the blower motor when the furnace is off. I noticed the motor capacitor was leaking goo so I replaced it this morning but the motor still hums and tries to move all the time. After shutdown, if I push the cover switch, it will run a few seconds then stop but if I repush it it will try to move then stall and hum until it cycles again then goes back to the hum.
Any ideas?