Any auto junkyard should be able to help you.
the air bag needs to be removed in order to have access to the screws holding down the switch.
You have to replace the whole button.
Have to replace the whole switch
If you mean the CONTROLS on the steering column (audio and cruise control buttons) are not working, there is a module buried deep within the steering column that allows the wiring from these controls (as well as the airbag) to maintain their connections to the vehicle circuitry even while the steering wheel is turning. It is called a "clockspring", and it's a bear to replace. Runs $350-500 at the dealer. This problem is very common to the LS.
If the horn or cruise control is INOP. Replace the clock spring (under the steering wheel).
why would you do that?
Most steering wheel buttons bulbs are not serviceable, you must replace the button(switch) or the shole horn pad, most dash and switch bulbs are not serviceable
They are pressed in and out with a set of special tools.
rebuild or replace gearbox.
do you mean the thermostat
i have a lincoln ls i had to replace both sides our ball joints are on a spindle the hole arm it might be called a control arm