The Fifth Amendment doesn't apply in this circumstance unless your conduct was criminal and you are fearful of incriminating yourself. If you take the Fifth, they will know you are covering up for your employer. Your employer should have counsel, and that counsel should be guiding you. There are ways to tell the truth, and then there are ways to tell the truth without volunteering too much information. If it makes you feel better, I rarely expect a current company employee to tell the truth, and assume they are covering. When a current employee lies, I generally don't press it, knowing that if the case proceeds farther, I can use their ridiculous denials against the company.
If you'd like to discuss, please feel free to call. Jeff Gold Gold, Benes, LLP 1854 Bellmore Ave Bellmore, NY 11710 Telephone -516.512.6333 Email - Jgold@goldbenes.com