My 2017 15” MBP has had a repeating letter G problem since about a month after I bought it. Right after I could return it. I’ve tried canned air on it and it fixed it for a couple of weeks and then it returned. How long does it typically take Apple to fix it? Do you have to take it into the store to be looked at before they will order the parts? Went through that with an iMac once and it was a painful wait. Thanks.