eBay sellers never say WHAT is wrong anymore. Hence, you either wait for price to drop or just guess that there is a blown fuse or they just don't care to test it and you might get a good surprize.
Not common, nonetheless.
The tuner in the SX-D7000 is probably better and stonger than the TX-950s though and you should be able to detune AM by 1 kHz increments as it probably also has 9/10 kHz switchable stepping as well.
This is handy for artificially bringing out a little more treble by taking it slightly off, like you would on an analog tuner.