I suspect I am being retaliated against after speaking up during an investigation against a former manager at work. I was passed over for the positio

I participated in an HR investigation in May regarding my manager. A number of employees, including myself voiced concerns and the manager was fired for job performance and sexual harassment. I applied for the position, but was passed over for someone less qualified who had only been at the company for 6 months. 3 months after the investigation I was written up for inappropriate discounted, and job performance. In 5 years of employment I have received Meets or Exceeds on every Performance Appraisal. I have consistently been praised for my performance and have won several awards. When I challenged the warning, the Area Manger was unable to provide substantial figures to support her claims ¿ she had no reporting at all. It is important to mention that the manager who was fired and my Area Manager were close friends ¿ spending holidays together. I feel that my career is in jeopardy for speaking out and I am being unfairly retaliated against. I work for a high end National retailer.