All IC's are NE5534's. TDA chips were the old -school version of the NE5534, not sure what the TL is, maybe a TL071? In any case, there is a NE5534 in its place. I would suspect that the NE 5534 sub is the issue, but again, another channel that is laid out in the same way, with the same chips, preforms fine.
All the chips have the needed 47pF comp/balance caps installed, but nothing else. No PSU bypass caps, No feedback caps(!), BUT AGAIN, another channel preforms "okay."