I’ve been doing some clean up on the filter unit for the Kenwood TS-430S HF radio. Some bands were not working and the filter unit was suspect. I had already tried the prescribed 12 V DC current treatment without any changes on the bands that weren’t working. I noticed several bad joints and manually disassembled each relay and checked its operation. At least two of them were not making good connections and required cleaning with some contact cleaner and a dollar bill. After this cleaning they seem to be working. I also noticed several bad solder joints. Here is some photos of the board.