First of all, here's the sears page where you can see blow-ups of some of the parts, and you can purchase repair parts:
KENMORE | Model #11072722100 | GAS DRYER | SearsPartsDirect.com
Here's another Parts link:
Kenmore 11072722100
If you click on "Cabinet" in the first link, you'll be able to see a blow-up of the cabinet.
Whenever you open the cabinet up, be sure and disconnect the power first!
Unfortunately, I don't know exactly how this cabinet opens up. Looking at the diagram, it appears that the top comes off first. If that's so, you might be able to lift the top off and position it so that the dryer can work but you can still see inside. Be careful because lethal voltages are present inside the cabinet.. Then, you can turn the dryer on and possibly figure out where the noise is coming from. I believe you'll have to remove the drum in order to repair it and possibly even to diagnose it. Once the drum is removed, inspect the drum bearing (center back, if present), the drum support rollers, the belt (if it's been slipping, it will be shiny), the idler pulley (through which the belt rides) and the motor pulley. You should be able to figure out which part is bad. Then, you'll have to order the part and replace it. Read the links in my message, above, so you'll know what you're looking for.
It's really not as hard as it sounds. When you get into it, if you have more problems, just respond to this thread and we'll help you out.