DEpend how you used it, or oc it
if mined directly or rent it out the cause of melted power point,

mine recently popped same taking out the $400+ 1kw PSU

only way it melts is something died shorted out inside it as bottom not sealed and everything exposed to metal shelves, water or creepy crawlies or pets  or PEST.

buy replacement hi-temp power socket resolder dont use cheap low-temp recycled china mades like used in all asic rigs plastic melts from temps from currents per pin so close to each other.

if i did not smelt it in time it was then arching over metal 12volts to ground. but i fear for mine it could be internal than patches of burnt marks


b4 turning back, power up, test for short across pins of mini board. i not tried it yet as i not ordered or found hi-temp pci/gpu power port/sockets online most are china/despatched and not rated enough for our country standard safety rating