LG 30" Over the Range Microwave Hood with Glide & Cook Tray, LMV1645S "vibrating sound start" Questions

Fan stopped working on our Bosch rangehood (Type D-FX41-8 or E-Nr. DKE935AAU). Lights working but the fan only inhibits a humming sound. hi ; the fan motor needs repair , the cause of humming is the ...