I have about the same dryer I’ve been keeping alive for years. I wouldn’t worry too much about the dull spot. That’s likely where the old coil got a hot spot before it failed. It’s just discolored the zinc coating. Shouldn’t effect heat dissipation but it might be more susceptible to rust now.
If you’re not in a big hurry, I would replace that white plastic bearing the drum rides on (you can see it on the very left in the last picture). It’s super squeaky when it fails. If you don’t replace it, at least give it a dollop of high temp grease.
Thanks for reassuring about the dark patch. Yes, it’s the exact spot the coil burned. I assume there was a brief flame during the burnout.
If you’re not in a big hurry, I would replace that white plastic bearing the drum rides on (you can see it on the very left in the last picture). It’s super squeaky when it fails. If you don’t replace it, at least give it a dollop of high temp grease.
I picked up a (too big, too expensive) tub of high-temp lithium bearing grease for exactly that purpose. My only wonder is how thoroughly I should clean off the old grease before applying it.
Getting all the old grease off isn’t super important. You mainly just want to get it clean enough to make sure the bearing surface on it and the ball on the back of the drum are smooth and not getting scratched/galled up.
Some greases are incompatible, and not cleaning thoroughly causes them to react chemically and cause issue, but unless you’re in that situation, you don’t need to clean super well.