Some of us are only on here a couple times in a day, especially on a Friday, please don't be impatient.
yes, close to zero ohms C-E is a shorted part. So it has to come out. At that point retest them out of circuit. They are in parallel in circuit, so one shorted can make all three look so. That is the bottom three.
For the same reason, if Q6 is shorted, as it appears to be, the other two ought to measure short as well. So look at the three emitter resistors there, R113,116,121. Are any open? If any are open, then recheck the associated transistor for shorts. Do it right at the transistor legs. In fact with at least four blown, I'd probably replace all six myself.
Might as well check the lower ones too, R115,117,122.
Yes Q5,Q9 are drivers. With mega blown outputs, those are instantly suspect, in fact I'd probably just replace them, even if they test OK with a meter. There is no way to test if they have been weakened.
But sure you can test them in circuit, like any other part, you just have to be aware of the circuit. If it tests shorted, it might be something else in parallel, so we THEn remove it for further tests. But if it does not test shorted, well there is nothing in a circuit that can make a shorted part look not shorted.
Always check the resistors associated with any bad transistor, in this case, R111,109,110,112. They can burn open.
testing in circuit: look at the uppers, Q6,7,12. See that 47 ohm resistor from their bases to the output bus? That is across their B-E junction. Your meter can't tell whether there is 47 external ohms or the part has 47 ohms of leakage. So we keep that in mind before we decide it must be shorted from the low reading. Flip the meter to ohms and find 47, and whatever the junction voltage, there is a good chance the part is actuaqlly OK.