A simple rule that's served me well many times, any electrolytic is suspect, doubly so if it's got a 4 and a 7 in the value.
Test C9 and C10 by replacement, it's not worth putting old caps of that sort of value back in circuit unless you're absolutely desperately short of parts, they smooth the voltage to Q3 which, if not smooth, will cause you all kinds of grief.
And yes, as Voltz says, Q1,2 and 3 need to be tested but I'd go for Q3 the 2SB435, I've seen dozens of those green Toshiba transistors go intermittently open in old CB radios (shoot me, I used to repair them)