E13 09/06/2007 REAR SUSPENSION OPERATION DESCRIPTION OPERATION NUMBER NPR W3/W4 N/W CREW NQR W4/W5 NRR W5500HD FRR WT5500 FTR FVR FXR HTR HVR HXR SPRING, AIR SUSPENSION - REPLACE E6000 - - - - - 1 1 HEIGHT LEVELING VALVE, AIR SUSPENSION - REPLACE E6002 - - - - - 0.7 1.2 RELIEF VALVE, AIR SUSPENSION - REPLACE E6004 - - - - - 0.6 1.3 RELIEF VALVE SWITCH, AIR SUSPENSION - REPLACE E6006 - - - - - 1 1 MAIN SUPPORT BEAM, AIR SUSPENSION - REPLACE E6010 - - - - - 1 1