How to check malfunctioning rear air suspension on e-320 wagon. Has become bouncy and seems to have no dampening. Is it best to trouble shoot and repair or isn't there a conversion shock absorber to disable the air suspension altogether?

 

normally these symtoms go along with lose of rear ride height. This is your rear leveling valve gone bad

 

 

how to check malfunction air suspension and what special equipment and tools are use?