I've modified and disassembled several of these radios. There's a second connection behind the cover. This will be disconnected as you remove the cover, but you

I've modified and disassembled several of these radios. There's a second connection behind the cover. This will be disconnected as you remove the cover, but you can easily reconnect it afterwards. I've done so myself to probe the various components (I only manipulated it while the power was off, though).