Hi, Just bought an 05 IC bus with a DT466E engine and an Allison transmission. The first thing I learned: It is extremely difficult to find technical information about my bus. Nothing helpful on Youtube, the Internet, the manufacturer will not help but referred me to dealers. One dealer grudgingly sent me an Operator's manual which is nearly useless. Many of the things don't apply to my bus and many I need are not in the manual. Like, what do the green, red and white air tank drain valves go to and why are they color coded, or what does the MODE switch do on my transmission panel, etc.. Or wiring diagrams (just spent 7 hours tracking wires). Where do I get those? I don't mind spending money but I am don't know on what and I am worried to receive publications which apply to 20 buses and make it impossible to find out what applies to my bus. Thank you.