1. Approach your immediate supervisor with the problem and try to resolve the issue through a discussion. You must discuss the issue. Your local steward may accompany you.
2. If no resolution, ask management for a PS Form 8191 (Joint Grievance Form).

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Blue ink makes finding the original easier. But Id fill it out with a crayon if thats all I had and it was my last day to file.
Definitely file every grievance by the book. However, be prepared to wait a looooooong time to see results