Spark 130, damaged secondary bridge diode, incorrect output waveform

Hello, I am asking for help with the Spark 130 inverter welding machine. The welder does not turn on - none of the diodes on the housing is on (there are two from the power supply and the other from overheating).

After dismantling I found a damaged rectifier diode on the secondary bridge with the designation STTH2003CG, it is SMD diode, 300V, 10A, 35ns. The diode had a short circuit, I could not solder it and it remained with the legs cut off, after connecting to the power supply, the output waveform is like in the picture - only slight sparking is visible during the welding test. The rest of the bridges are efficient.

What should I pay attention to and what else to measure? The tile was soldered with a series of goldpins, unfortunately, when I unraveled the path was not durable - now I did it on wires - it is possible to disassemble.

I would check the switching circuit of the relay (the one on the "top" itself) - performed probably on the operational 324 - because the power goes only through the start resistor. However, it should be remembered that the cause of this condition may be some damage - I would not use "force" methods.

Check the IGBTs and generator layout on uc3845 plus l6383ed. You can use the service manual for gossips 165 posted by me on the forum, because from what I see, it is very similar to her, and gays 133 is identical, but I do not have SM, and the forum is only a bare schematic, so you can help a little bit of both. It describes exactly what and in which order to check. I will only suggest that you start by checking the protection resistors in the generator circuit.

The generator system itself is quite simple and should not cause problems in the repair, but repairing the power block is a challenge - a quartz heater and a hot air station, a good lead-free flux and a lot of practice are needed. The repair procedure, and the place where you can get cheap igbts, were described on the forum. Browse my old posts.

P.S
Scheme for an identical 133 gaming machine
link:

https://www.elektroda.pl/rtvforum/topic1825696.html