1960s 67 power antenna has power but doesn't go down

[kyle242gt]

Hi all - curious if anyone has bright ideas... Reconnected my 1967's power antenna (was connected to remote toggle by PO) after verifying power to both green and blue wires in the engine bay as expected when pushing/pulling tuning knob.

Have power to connector at antenna for both green and blue as expected, but goes up, but not down. 

Jumping brown to blue at the radio connector makes it go down, so it looks like the relay in the radio is the culprit.  Is this a common thing?  Something end-user fixable?  I honestly don't really intend to use the radio, but I'm trying to get everything sorted on general principal.

Thanks for any input!

[kyle242gt]

Caught myself gathering parts to wire in an external relay, figured may as well give it a look see. 
Took the bottom of the radio off, and the relay contacts are visible, though not super easy to get to. Pulled a few parts off to get some space, snaked a teensy piece of emery cloth in, cleaned the contacts, and voila!  It works now.

Posted for posterity in case it helps someone down the road.