Yes, I noticed the corrosion. (I just got this xcvr last week!) Give me a break, Allen!
I have taken the interesting battery "holder" apart - cleaned it out. Replaced the LR-44 corroded batteries. Bingo.
Did you notice all the blue/green corrosion comming out one end?
Maybe the batteries need replacing. Think maybe?

??
Get that thing out and clean all the goop out before the rig is ruined.
Allen KA5N