MOTM

The LFOs on my 410 have just stopped working, everything else works fine. I have checked over the LFO circuity with a scope and there is no sign of any oscillation. All supplies to the ICs are correct. I am guessing it is either U5 (TL074) or U6 (NE5517) Just wondering if anyone else has had this problem before I go changing components.

Thanks in advance