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Yes, I agree, the only possible failure here is Q1/Q2. Are you sure that these are BC560 and not BC550?
Also, pin 7 of the opamps should be at 15V. Then you have pin 4 at -15V,15V. This is probably a typo. If not, pin 4 should be at -15V on both opamps. But pin 7 not at +15v indicates a problem.
Before you do anything else remove C1 from both channels. Let's decouple the AC just to remove this as a possible transient startup problem.
Also, pin 7 of the opamps should be at 15V. Then you have pin 4 at -15V,15V. This is probably a typo. If not, pin 4 should be at -15V on both opamps. But pin 7 not at +15v indicates a problem.
Before you do anything else remove C1 from both channels. Let's decouple the AC just to remove this as a possible transient startup problem.