Update with good news!
Thomas came over last night with his not-sold-in-the-USA portable steam cleaner and thoroughly cleaned this washer inside (w/o disassembly) and out. It looks much better to begin with and the door boot almost looks like new again too. It <span style="text-decoration: underline;">did not</span> have any mold stains, or anything really gross, it was just discolored, like it was really old.
Part 2: The heater DOES work! This afternoon to clean the washer again, I started it with an Affresh tablet, the Whitest White cycle, "Extended" option and "Sanitize" temp. I did not purge the hot water line before I started it, so by time it reached the proper water level, the water inside was
maybe slightly warmer than warm, if that. Again about 3 minutes into the cycle (attention Launderess), 10 minutes dropped off the time remaining (I wonder if it has some way to sense of it's running empty or not?). Thinking I may have wasted an Affresh tablet by running it with "warm" water, I went in the house. About 20 mins later on my way out to buy groceries, I walked by the Miele and put my hand on the door glass and WOW it was extremely HOT!!! HOORAY!
What I now think happened the other day when I assumed the heater didn't work is: I started the Normal cycle, Hot temp, Extended, Heavy Soil & Soak. When I walked by after 2 hours, it must have drained and filled with cold water for the soak. Duh! LOL
Part 3: After the steam cleaning and this latest "cleaning cycle" with the sanitize heated temp, there is not even a hint of any moldy / mildew smell from this washing machine! Woo Hoo!
Kevin