Help needed with replacing transistor on Krell S-300i amp.

Hi everyone, I need some help regarding replacing one of the transistor on my krell s-300i amp.

The transistor has a marking of 1GW (very small transistor). I googled and it shows up as BC847C. I also notice that several other similar transistors have been replaced (bought the amd 2nd hand). I think they don't really last (read about high failure rate of this amp).

I am thinking if there are any alternatives for this? Something that could last longer.

Thanks for the help!!!