help needed with a frozen tuner

[jbivy]

I picked up the solid state chassis and turn table out of a 1964 nordmende console stereo. The speakers were already robbed from it, but it played a few years back. But the tuner is now frozen. Its encased in a small stamped together steel box. Im wondering whats the best way to open this darn thing so i can get it unfrozen. Its an interesting chassis being multi band and set up for six speakers, might look good in a custom wood case.

So anyone here experience this problem before, how did you handle it?