We recently rebuilt the top end of the cylinder valves and the compressor was working properly. After a week the compressor started to unload air out of the Governor housing(centrifugal release valve) once the compressor gets hot. We inspected the pin, plastic ball and spring, what we found was the ball was out of round. We replaced the release valve assembly and it is still doing the same thing, and getting very hot. Not sure where to go from here, any help would be greatly appreciated.