I know exactly what happen because I inadvertently cause the same error message to appear on our 35cp. It happened when I turned the key to start as if I was in my suv without waiting for the required time…oops. The check suspension message appeared soon after I properly re-started the coach. Apparently the solenoids didn’t properly pass the initialization check because I jumped the gun at startup. Anyway, I was able to clear the error message and haven’t seen it since. So I suspect the tech at your dealer made the same bonehead mistake I made.
2022 35CP Bus (2018 Open Road 32SA SOLD)
2018 Jeep TrailHawk
RoadMaster NightHawk (keepín it together)