PS4 Pro Power Short Issue

The unit was brought to me last year and I replaced the supply after finding it was dead and didnt want to take a chance the unit was faulty. Once i installed the new one and powered on, the unit blew out the new replacement power supply right away. Ive did a visual inspection of the motherboard but havnt found any obvious spots of burnt or shortage. it did have some dead roaches in the unit but not a large amount. I have found a lot more on previous units in the past. I just tell the customer there will be a charge for Bio hazard clean up lol. Anyone have any ideas what could be shorting out the motherboard blowing the fuse on the replacement power supply.