Hello! Today I have several S19 Pros hashing at about 70 Th/s, all throwing up hash board errors. I am looking to consolidate the ones that are working and have a few fully functional miners vs seven almost-fully functional miners. The problem I am running into is I am not sure which hash boards are the broken ones - how does physically identify the malfunctioning hash board? The top exhaust fan is blowing cold if that helps.