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My 2009 LTZ had the "Service Trailer Brake System" light came on. I find an article which advised to replace the trailer brake system relay which I did. However the light is still on. Does anyone have any other suggestions?

I have a 2009 Tahoe LTZ with 110k miles. The "Service Trailer Brake System" msg came on. I researched a solution on-line and find I need to replace the Trailer Brake Relay and a fuse. I did that but the msg is still there. What do I need to do to fix this problem?