[Elecraft] k3 problem

[Bob Gibson]

Hi Fellows.. I have a friend that I'm trying to help.. he is 85 years old and has a k3. He turned on the radio today and got a err exf message... or he may have said err txf. not sure.. I told him I would try to help him.. he is in OKLA and I'm in Florida so it is not easy.. Can someone please tell me what the message means.. and I will call him back. He is a very dear ham buddy of 60 years. Thanks    73s Bob W5RG