Was the FIRST notice you got (not the courtesy notice) within 15 days of the violation?
Other than that, if you can somehow post links to the videos with any identifying info removed that would help. As would details of the alleged timing (after yellow, etc.). Also location (intersection) in Ventura.
Unless the red light was a protected (red arrow) light -- rare for a right turn -- check the yellow timing on that signal. It should be based on the speed limit approaching the signal and should conform to the following table
25 or less 3.0