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I recently took my plane in for its annual, and when they did a final run up the ECU is creating a hard fault (solid yellow ENGINE light). Has anyone seen this or any have insight to the potential cause.

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The EGT probes that cause this are very very likely done (failed). This can be confirmed by looking at the value of the EGT probe. They typically fail and flat line above at 1300 C. You can see this on your screenshot as its "above range" You will need to replace the probe. Buy a spare as they fail fairly often.

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That was it. Simple fix. As always…Thanks.