I found a video on Youtube which described dryer drum squeaks as most likely caused by a worn rear drum bearing.
I located the model number on the inside lip of the dryer door: Frigidaire Affinity LEQ6000ES2. I googled "frigidaire affinity dryer squeak". I got a link for my friends at AppliancePartsPros.com! I've used Appliance PartsPros 3 times before, so I figured I was in a "one-stop-solution" situation.
I ordered a rear drum bearing kit as well as a dryer drum belt (after nearly 7 years of heavy use, I figured it would make sense to replace that as well. Everything arrived within 2 days of order, as usual, APP is very prompt.
After receiving the parts, I watched a video here on Appliance PartsPros showing how to replace the rear drum bearing. I followed the procedure closely, as my dryer was very similar to the one shown in the video. It took about 2.5 hours to complete, including the extensive lint-cleaning I did while the dryer was disassembled. The only tricky parts: 1) reassembling the frame: it was tough to get the screw holes of the frame pieces to line up after being apart: I mean really tough. 2) tapping the threads for the new ball hitch was more difficult than I thought it would be. I had to use a power screwdriver to power two of them in as the manual screwdriver bit was just slipping out of the screw head when I tried to muscle them in by hand.
I found that the gasket on the blower wheel assembly is getting pretty tattered, I'll be replacing that very soon. If your dryer is over 5 years old, you may want to consider getting that to start with.