1. Remove CPU/DSP unit by unscrewing three silver screws holding it down (the silver
box on the top of the radio with copper taped sides) and pull up.
2. Locate four shift registers and bank of diodes - shift registers are 4094's. There are
two next to each other and then a couple more. We'll call the two stacked the "left"
ones
3. The "middle" shift register if looking from the front of the radio is the target.
4. Locate bank of SMT diodes (silver with "K" on top on one side) in front of the target
shift register. They are in two columns, "left" and "right"
5. Unsolder one side of the second diode from the front on the left and lift up one side
(or remove, slip to the side, whatever turns you on)
Thanks to Luma for this piucture.