Well, it didn't explode, but it definitely sounded like it.
The past few weeks, our washer (Maytag MHWE400WW01) has been making a clanking noise during the spin cycle, like there was a marble or something in between the tub and the drum. It sounded pretty metallic - as in the loose object was metal. You could even spin the drum around manually and hear the clanking. I pulled the machine apart and tried to get into the tub every way you can (top water access, bottom drain, back heat vent) with every tool I could think of (clothes hanger, mirrors, etc) and couldn't find the object. I suspect it was in the "back" of the drum. Nothing in the lint/coin trap or at the bottom tub drain.
Then we did something stupid - we ran the machine for a few weeks, because, well, laundry had to be done. We were sort of hoping the machine would just run anyway. And it did - until yesterday. During the spin cycle, it made a racket that I imagine sounds like a claymore mine going off in a bank vault. Now, the drum spins really rough, like it's off its track or something. And it's much harder to turn - definitely a lot of resistance.
So, what did we do? I've been told that tub/drum repairs on modern washers are so expensive that we might be better off getting a new unit. Is that generally true?