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Remove/install loudspeaker amplifier control unit - AR82.62-P-7720EWM

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MODEL 212.0/1 as of model year 2014 with CODE 811 (Advanced sound system) 

Fig 1: Loudspeaker Amplifier Control Unit Remove/Install Components (1 Of 2)
G09977637Courtesy of MERCEDES-BENZ USA
Fig 2: Loudspeaker Amplifier Control Unit Remove/Install Components (2 Of 2)
G09977638NOTESNOTESREMOVINGINSTALLINGREFER TO SELF-DIAGNOSTIC SYSTEMSINSTALLATION IMPORTANTNOTESCourtesy of MERCEDES-BENZ USA
NOTES Information on preventing damage to electronic components due to electrostatic discharge   AH54.00-P-0001-01A
NOTES Notes on avoiding damage to optical fibers during repair work   AH82.60-P-0001-05AK
REMOVINGINSTALLING Remove/install     
1 Connect diagnostic system and conduct initial startup of sound system amplifier control unit (N40/3) and rear bass speaker amplifier (N40/9) When replacing sound system amplifier control unit (N40/3) and rear bass speaker amplifier (N40/9).  
REFER TO SELF-DIAGNOSTIC SYSTEMS     AD00.00-P-2000-04A
    INSTALLATION IMPORTANT Copy buffered basic data to new sound system amplifier control unit (N40/3) and rear bass speaker amplifier (N40/9).  
2.1 Switch off ignition and remove transmitter key from electronic ignition lock control unit Except CODE 889 (Keyless-Go)  
2.2 Switch off ignition and remove Keyless-Go start/stop button from electronic ignition lock control unit With CODE 889 (Keyless-Go)  
3 Release stowage compartment (1) (arrows) and place downwards on trunk floor (2) NOTES Carefully place stowage compartment (1) downwards on trunk floor (2).
Otherwise the sound system amplifier control unit (N40/3) and rear bass speaker amplifier (N40/9) may be damaged.
 
4 Detach electrical connections (3, 4)    
5 Disconnect electrical connectors with optical fiber (5)    
6 Remove expansion rivets (6) When removing sound system amplifier control unit (N40/3).  
7 Remove nuts (7) When removing rear bass speaker amplifier (N40/9).  
8 Remove nuts (8) When removing sound system amplifier control unit (N40/3).  
9 Remove sound system amplifier control unit (N40/3) or rear bass speaker amplifier (N40/9)    
10 Install in the reverse order