i have one pre3 that is silent mic, and one pre3 that is transmitting nothing but screeching sounds. didn't even think to try the video recorder. hmm.
The silent one is also silent in video recording, and in the interactive test.
The screeching one is currently trying to be doctored, but it keeps rebooting unexpectedly. ... and now i have a US Pre3 that has come up with language options for English, Spanish, French, German, Italian, and Japanese? Chinese? .. weird. Looks like it thinks it's an emulator, must've missed the device customization, oops. Wonder if that might have something to do with it.
Anyway, screeching one works fine in the interactive test, and in the video camera.
Screeching one during auto tests gives error code 25 on Wi-Fi and 20 on Modem, silent one gives error code 1000 on modem, but it doesn't have a SIM installed so that's probably the problem there.
Screeching one also screeches with wired headset, and silent one is also silent in wired headset. I'll see if tomorrow I can run them on my car bluetooth to see what happens there. I suspect that screecher will probably also screech, that seems to be either an audio encoding problem or a modem problem.