I recently bought a 2005 RAV4, and I'm planning on doing a transmission fluid change using the return line method. I'm wondering if it is necessary to drop the pan and change the filter + pan gasket also. I've heard conflicting info about the filter (some said it is just a screen and not a filter), so it would be great if experienced members could comment on this. Can I drop the pan, clean everything and reuse the existing filter? Thanks in advance!