Our clothes dryer is currently working; it gets up to and maintains heat, no shuddering, dries clothes, etc. However, it is louder than it used to be. It is an older unit (Whirlpool Dryer LER4624DQ0), bought second (or third?) hand. The noise is a squeaky kind of maybe-rubbing (?) noise. Here is a site with exploded diagrams of the model.
Short of disassembling the dryer, what can I do to help quiet down the unit? Is there any maintenance I should be doing that might help it be quieter?
I found one answer, that it may be the main bearing on the on the drum or one of the roller guide wheels of the drum. It didn't speciy how to oil them though, if that might be the case, what should I use? Another suggestion was to soap the serpentine belt, but I am having difficulty figuring out if they mean undoing the entire back assembly behind the bulkhead.