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Older Rigmaster Apu has red light on status and constant beep. Beeps for 20 second intervals. Nothing in display at all. Any ideas????

Can those of you familiar with EGR failures on the MBE 900 share some knowledge on this subject? The EGR valve on our truck has been replaced twice within 2 years due to carbon buildup. I have records of prior maintenance on this truck. We just purchased the truck and the check engine light is...