Let assume C4 is good, so you should get wave at collector of Q1, collector of Q3, Q4 and TP1.
If you can't get then all upstreams BCE, we need the voltage measurement.
Any wave get through any of them, we are happy, because then we eliminated the CR5 from the list.
If non get through to Q1, then we only hope C4 by replace it and try again until lastly - CR5.
I think that should be the safe procedure to approach.