It will work, the 6215 PSU is 50W, the 6055 is only 30W, you can use the 50W on the 6055, but you can't use the 6055 power supply to run a wavebox. The power supplies don't last indefinitely. In reasonable conditions, they last about 3-4 years. If the humidity is above 70% or the temperature is above 30C where it is positioned, the life can be shortened dramatically. It is the same sort of power supply a laptop computer uses and while most of us cycle through laptops before we see the power supply fail, they also fail after 4-5 years and the longer life is largely due to it being called upon less frequently. The correct PSU is 6055.240.