The motors don't have the warranty. The blue card only covers the speedo.
What's wrong with it? If it is overheating you can check whether you are running a sintered rotor and change it if not or if you are having trouble with the sensors try cleaning the electronics at the bottom of the can once you have the rotor out with a cotton bud and motor cleaner.
If it has desoldered due to overheating you can clean out the solder and resolder the winding packets with lead-free solder and a HOT(!) big tip soldering iron.
Otherwise bin it
