I have a dead controller with what's looks like a power transistor. I measured it as SOT-89 SMD package, it takes 36-42 V in and probably out 5 V. it's marked "BE RJ" sideway on it. I did find lot of BE Rn or BE Rc but Google can't help for that exact silkscreen. The collector is not connected to anything. And I guess it should be rated for something around 1 A. On a Chinese site there's one eventual match for a 2SB1260 in its T100R version but impossible to be really sure.
If anyone master alltransistor db enough to help, me I'll really appreciate it.