A year or so ago I asked the group for suggestions about fixing the unreliable remote for my 407 which sometimes worked, more often didn't. Little response. So, after it failed completely, I tried a fix I have used successfully with other electronic hardware. Nothing to lose!It is easy to open the remote with a flat screwdriver. It is then easy to replace the battery. But first I tried my fix - I sprayed the whole thing, especially the battery and the three switches with circuit board cleaner (this is alcohol-based and comes in a pressure-pack with a fine tube you can stick in the nozzle). It was easy to put the remote back together. Result? Works perfectly.