Sorround sound switchboard lit up and quit working.
If the fan is making weird noises there is either something wrong with the bearing or it has ingested something.
Maybe you could look, listen closely and determine which it is. If it's foreign matter you may be able to extract or vacuum it out. If it's just bearing noise, you have to decide how bothersome it is and if a shop visit is justified. A clog is BAD because the fan is protecting the unit from high temperatures.
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