Untested.
Has some corrosion due to long term battery installation.
The only evident damage is that a new battery holder will be needed. There is also some corrosion on the foil lining the inside of the bottom cover and around the "Mic Amp" switch.
The microphone cords appear to be good, although there is a little surface corrosion around the outside of the connector of the external microphone cord.
Parts/repair - no returns.