2003 Mercedes-Benz S500 4MATIC Questions

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Bought 2003 s500 4matic
Car was very low on all 4 wheels, owner said it needed back air shocks. Dash says "car too low"
Took it to a mechanic, they said suspension compressor and suspension relay don't work. They also said it could be something else, since computer scan doesn't let them go past that point.
Should I change the relay first? Could it be something else?
Where are the suspension compressor and relay located on the car?
What do you advise I do first?
Everyday i have issues either starting the car or turning the key. Sometimes i unlock the car and put the key in the ignition and it wont turn or just takes a while before it can and then sometimes it will turn but does not start up. What could be the problem?
At oil change, what type and viscosity should be used?
lights, music, horn and heat works but it wont start
it wont turn on or crank over but everything works
when i start blower then compressor is on.and ac switch(on off)is off.what reasons.pls help me.
Recently I reloaded my CD changer which is housed in the trunk and when I turned on the audio device, it did not recognize the CD Changer. What are my options to this dilemma?
The manual indicates to remove the screw securing the battery and remove the battery support and bracket. Where are these two items located as there is no apparent screw / bracket on the top side of the battery. However, the battery cannot be moved and is obviously locked in place. There is also no obvious screw or bracket looking from underneath the car as well.
the car won't start some times, the code showed bad CPS
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