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Lincoln DC400

Hi all

I have a very annoying issue with a lincoln DC400 SN : A1051200178 CODE: 1386

Complaints of a buzzy arc

After testing myself and with a very experienced welder i was able to notice this issue, i have performed NO Load SCR test and Active SCR tests ,also diode leak tests, checked all aux windings

From what i can hear i feel like the diodes are leaking but these tests show me the're not

Also disconnected Caps with no avail

In Short i have performed every test from the service manual

Any other test ideas would be appreciated