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You will need to dismantle your dryer and examine the rollers, drum seals, idler arm, and motor pulley. Any of these parts could be causing the squeal you are hearing. Here is a video that demonstrates disassembly of a dryer similar to yours;
Always unplug or de-energize electrical equipment before removing covers or attempting service. Be careful and wear appropriate hand protection when working around sharp metal parts.
The dryer in this video may not look exactly like yours, but the procedure is basically the same.
If you do not feel confident repairing this problem yourself, then you can have it repaired at your home by a Sears technician. Here is a link for the website:
Sears Home Services
Here is a link that you may use to view the parts list diagram or to purchase any parts needed;
Sears Parts Direct
I hope this is helpful. Check the things I have covered here, and if I may be of further assistance, include more details in a reply to this post.