You receive a letter from an FAA inspector stating that the agency is investigating a report of a specific event that occurred twelve days ago. The letter describes what the FAA believes was your involvement in the event that may have been in violation of some FARs. The letter invites your written response. You were there on the date they mention and were exercising the privileges of your certificate, but feel strongly that they've got the rest of their facts all wrong.
a. Are you required to respond to the letter?
b. What will you take action ?