I'm currently having an issue with the air system. every time air would build up and reaches 120 psi it would not purge, but with the ctis ecu it will purge. every time it reaches 120 psi there is a loud noise coming from the compressor/governor. Ive tried using the tm and I used the section in the air system troubleshooting section that states air builds more than 120 psi and it came to a conclusion saying to replace the air dryer which I have and I cleaned out all the check valves and still didn't work. any ideas or suggestion is greatly appreciated
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