I have an MSD box, which is an ignition box for a vehicle. This transistor seems to intermittently spark a little around the edge when engine is running. I can see it at night when I block the light around the box. Now, Is this due to that piece not being grounded properly with the screws holding it down tight enough , or would it be something else? It has 2 and only one does this and it does get a little warmer than the other one that doesn't spark. I don't know anything about electronics to troubleshoot. Thanks!! Also, has anyone here ever repaired MSD boxes?