Codes from interrogation may be more specific than dash messages, and there will very likely be more than what you have seen on the EVIC. The order they occur in would also be informative.
Codes are always stored (some self-reset in time). If they told you there are none they are bullshitting you. I'm not sure if they are set up to print them, but if they haven't been cleared they could at least take a photo of the display monitor.
My warning senses would be on full alert by now.
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