Could someone tell me how to remove the circuit board from the climate
control unit (CCU) in a 1989 420 SEL? I have the CCU out, opened the bottom
plate, by removing 4 tiny screws. I have removed the pin from the temp.
control wheel. Lifting up on the back of the board, the front push buttons
seem to be retaining the board in the case. Does anyone know how to
disconnect the 5 push buttons from the circuit board so that the board can
be removed from the case for inspection and re-soldering? Will there be
anything else that inhibits the removal of the circuit board, other than the