70 Service Schedules VN, VHD TYPE OF OPERATION CHECK / CHANGE BASIC (4 MONTHS) CHECK / CHANGE ANNUAL (12 MONTHS) ADDITIONAL SERVICE Check Air Dryer X X Valve Adjustment X REQUIRED: Once a year, every 130,000 miles, (209,000 km) or every 2,500 hours, (whichever comes first) Check Warning and Control Lamps X X Check Fault Codes displayed in the vehicle Instrument Cluster X X Check Air Compressor’s Function and Condition X X Check Hinges, Doorstops, Locks and Sealing Strips X X Check External Lamps X X Check Rear view Mirrors and Reflectors X X Function Check of Wipers and Washers X X Check Headlamps X X Check Hood Attachment and Locking Devices X X