Can someone advise please......

Call out to above system problem no cooling check fascia lights on cassette indicating faulty
outdoor PCB. This is my first visit to site, but they've have had previous problem, ie condenser
fan motor replaced. I am a bit wary of replacing PCB due to it possibly blowing again, has anyone
had this.....do I need to check further to see if other component has caused PCB to fail.
Obviously all under warranty but customer not happy!!!!! System 18 months old.