Tihones

This is a sako inverter. a capacitor c138 of unknown value caught fire, presumably shunting high-frequency interference at 350v. from the burnt rectifier diode, two 75g60, and two k100e10e1 on the low side. I am trying to check the signals by short-circuiting the output of the optocouplers, 350v rises, but I cannot get signals to the sine transistors. please help, maybe there are ideas on where to go next.

Good day. Newbie on the forum and in inverter repair. I was working with phones and other electronics. And now, in three days, two of my inverters have burned out. Photo of one of them.