I currently have a 2002 Tahoe. I took it to the dealer and they said I need 2 new rear shocks, compressor and an ESCM. i replaced the rear shocks and Compressor but can't find any information on where to get the ESCM (Electronic suspension control module ) or where it is on the Tahoe? My service ride control light is on also. Oh I also replaced the rear shocks with monroe air shock conversion kit. thanks for any help