My kenmore elite also was drying less, taking longer to dry. I was able to disassemble it by checking youtube. The exit duct from the drying drum to the hose leaving the back of the dryer was full of lint. In my case this was in the front of the dryer. Now I clean it every 2 years as a maintenance task.
This won’t help people with repairs, but I just have to brag about my luck. :-) I was browsing through a big flea market (does flea market translate in other countries?). I bought a couple of cheap tools that I needed . . . then I came across a typical table with some junk, and there I saw it. A Gen2 Nest! I picked it up and it even had the base attached. I asked the guy if it worked, and he replied: “what is that thing anyway?”. I can’t even tell you how cheap it was. I paid the guy and headed for home, plugged in the USB cable, and it works. I haven’t installed it because I replaced my failed Gen2 with a Nest E that was on sale for $129. But now I have a spare Nest for when it inevitably fails. Even though I’m angry about the Nest policy of not selling parts, I have to say the Nest E is good. It’s missing some features, but it has what I need. The display is not high-resolution, but it’s good enough.