I would call that board toast. It is the same problem that Airsoft Surgeon boards used to have. They had no low-voltage protection, so when the voltage dropped from a depelted battery, or if you used a 7.4V, the motor would draw more current. It is a destructive feedback cycle, and the excessive current burnt out the trace.
You can try to fix it, but it will always be weak, and will blow out on you again.
If A&K is compatible with Gen 3 Systema electronics, I have a bunch of those kicking around. No idea though on how many actually work.
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Age verifier Northern Alberta
Democracy is two wolves and a sheep discussing what's for dinner.
Freedom is the wolves limping away while the sheep reloads.
Never confuse freedom with democracy.
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