Light primer strikes

[Getoffmylawn]

I have a Marlin 336 .35 Remington Lever Action rifle. I recently thoroughly cleaned it following a Russian Boar hunting trip to Texas. The first time I shot it following the cleaning, I experience 5 out of 6 light primer strikes. Only one of the rounds actually fired. Following the light strikes, I removed the breech bolt and the three piece firing pin assembly. All seemed fine with the associate parts. Following re-assembly, the rifle continued to light strike. Does anyone have any suggestions?

[Photoguy67]

I am not a gun smith, but it would seem that if the firing pin is not binding or anything along those lines, then the problem would almost have to be a weak hammer spring.