replacing the board may not permanently fix the problem.
did you replace the headers when you replaced the pins and housings and did you use the high temperature versions?
I would replace the fuse holder and solder it on the top and bottom of the board. the fuse holder can melt if the solder joint is bad or the clips on the fuse holder has lost its tension and is not a tight fit on the fuse, even a cheap / faulty fuse can cause this to happen.
also make sure that the fuses are the correct value and all the G.I. wiring is correct.
make sure the voltage setting is correct I.E. make sure it is set to 240v not 210V, if the voltage is set wrong the lamps will draw more current and stress all the components in the G.I. circuit.

If it is all repaired properly then you shouldn't have any dramas.

I am happy to take a look at it for you if you get stuck