So Q1 is working properly then.
Mine doestn have that brake. I assume its a RC voltage filter (100ohm + the big cap). Its fine if you bypass it with a glob of solder on the broken trace to see if that was the problem.
So all of your transistors measures seems to be ok. The problem could still be on semiconductors (you can check voltages for all the Ics) but honestly I think its somewhere else. I tough it was Q1 but youre meassurements showed me Im wrong.
You can look for cold solder and/or playing while you move transistors and caps with your fingers. Also have you disscard wire problems (bad cables, loosy jacks) and all external problem (make sure it was the only pedal on the chain, not an amp tremolo, etc etc)?