It's probably a non-issue; over time, it's normal for some metal wear to occur inside the transmission, metal on metal wear surfaces. The DQ250 does have a few magnets that pick up metal shaving, too; those can't be accessed without a teardown.
It's not uncommon for those to have input or output sharf bearing failures, but you can easily hear those; you get a loud whining noise at speed.
Here is an example of what you don't want.
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