Unit showing PR Off. Pulled cover to see a part burnt out (see below). Looks like a short at TH6. I am trying to determine if the entire panel needs to be replaced; if TH6 is related to zone 6; if any may have an idea as to what could have triggered this; and options may exist to fix it. Other info: fuse has been replaced, power outlet/breaker are good; I still need to check power adapter. I want to be sure I rule out a problem in another zone or wiring before I just replace the panel. Any thoughts would be appreciated.