I'd remove the top of the smoke unit/ fan housing, gently pull the impeller off of the shaft and put a drop of oil on the bushing at the base of the shaft.
Replace the impeller and spin it with your finger several revoltutions to work in the oil.
If it still doesn't work then order a replacement from Lionel or one of the other parts vendors on the forum.
For some reason Lionel doesn't list the fan motor separately in the parts list for this loco. They should have one, most of them are the same from loco to loco.
Send Lionel an email with you request to the "Service/Repair Question" here: Contact Lionel. Given that its the weekend, you should hear from them on Monday.
BTW I'd order new wicking and replace it while your in there.
I had the fan motor on my 2008 Legacy PM Berk stop dead a year after I bought it.
A couple of drops of oil on the bushing and its till works to this day.
