So then...
We water-tested outside, and found that everything looks great. Amazingly, on this unit, the pump housing appears to be metal? I thought D&M used bakelite for all of these. Fascinating.
No drips, and no signs of them in the past, either. Yay!
However, when we brought it into the house, I heard a telltale "pssssssss" when the unicouple was attached, and the water turned on. The rubber washer where the unicouple attaches to the water valve was rock-hard and shot; it was lobbing a stream of water toward the cabinet. We broke it into pieces, and replaced it with a new one (after a quick mopping of the floor). Hooray for machines that need a quick tweak to get on their feet!
The unicouple ring is broken--you can see where the plastic contracted over the years, and snapped. The whole assembly will probably need replacement, since--if the crack rotates over the ball bearings--they can fall out.
Still, all that notwithstanding, she just needed a lot of cleanup. She smelled like an ashtray, and was covered in that coveted film of tar and nicotine, which--oddly--seems to act like the world's best metal and finish preservative.
After a thorough detailing with some degreaser, here we have...
