ZZ9000 missing Q4 transistor

Question for Lukas.

I have one of the original ZZ9000’s in an A3000, the Q4 transistor and D1 diode fell off as its very close to the edge connector. I have since modified the card so it now fits without flexing the board and slamming it into the edge connector. I have replaced the diode but wanted to get a recommended mouser part number to replace the missing Q4 NPN transistor.