I am a painter/wallpaper contractor. A friends house had an addition done 15 years ago. Most of the tape in her master bedroom, 65 ft. worth, is lifting. While drywall is not my specialty, I have some experience. My first thought is to cut out the old tape and redo entire job.
I felt I might be making more of it than necesary. Would adding joint compound under existing tape, and then skim coat afterwards be an easier solution, or a ticket to further frustration?