I did the SWR mod on an FT-100 that I bought used. I had the high SWR problem on 440 and 10 meters. Aparently it appears on different bands for different people. When I had it apart I added the 500hz CW filter. Now I know why there are so many CW filters for sale used. (tight fit not the faint at heart) - I love the radio, it works perfectly now. It's a great little performer - Go to http://www.k0lee.com/ft100faq.html
and read all about it.