Problem with Zero Point Dual Delay

[Hourglass]

Hello!!
Last week organizing the room, i found this pedal which for some reason only gives me clean sound.
I test voltages of ICs and transistors and seems ok.  I check with a audio probe where i can hear sound and this is the result. Green points give sound and , "x " or red points not. I will check cold joints on red dots.
What can be wrong?? Any help will be great! Thanks in advance!!!

[jimilee]

Check for solder bridges and shorts to ground. The green dots, are those effected signal or clean signal? From where did the pt2399 come? There are fakes for sure, have any known good ones?

[Hourglass]

Thanks for your tips, i dont remember where i bought those pt2399 
For de Tl072, i've clean sound, and for the others green dots i've the effected signal and clean sound (looks like iC2 is working)
This weekend i'll work on it and check joints,   i think change de IC3, is normal that pin 14 dont give me sound?