If you can point to the violation, bring it up, many times that's all it takes to be corrected, everyone makes mistakes. If it's still a violation but you are FAR legal, fly it and grieve it. The grievance will yield a remedy- likely a payment or comp day, sometime both. The unfortunate reality is if not grieved, it's not known as a problem, so some get to be the sacrificial lamb for the rest. Once it's known that an illegal (to the contract) situation has occurred, the grievance process will put in place additional guidance so it doesn't happen again (theoretically). No process exists without finding a problem and fixing it going further, and it unfortunately occurs across both regionals and majors.

Some may scream BS from the highest of vocal chords, but in the end it works pretty well. As stated, someone normally ends up the sacrificial lamb in the process and gets some $$ or extra time off, post event. The "fly it, grieve it" mindset keeps the situation away from hurting the operation and meeting with someone who can levy a harsh punishment, and instead keeps you a victim of circumstance and an innocent example of what should not occur going forward. Love it or hate it, but that's how it works.