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Phoenix 12/50 Charger - burned resisters. HELP!!!

Hi

We are cruising in remove Raja Ampat in Indonesia and there are no electronics experts and no way to get parts. Our Phoenix 12/50 battery charger has stopped working. Some smoke came out and it stopped sending power to the batteries. There are some burnt resisters in it. I have measured across them and it's about 0.7 ohms so I guess they are still working? This seems to be a common problem because these people also seem to have the same issue:https://www.youtube.com/shorts/j7F4fv04wfk

https://community.victronenergy.com/questions/227621/phoenix-1250-charger-panel-blown.html

Also, these resisters have clearly been replaced some years ago by the previous owner of this charger. I desperately need some advice on how to fix it. A circuit diagram would also be a big help.

Thanks
Mark

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