Such knowledgeable personnel can help pinpoint your problem areas as well as suggest paths of action that you may not have thought of. (careerresumes.com)
Had this same issue with my last car, I even took it in to an electric shop and they couldn't pinpoint the problem. (mechanics.stackexchange.com)
* Excellent problem - solving skills, with the ability to quickly pinpoint problem areas and resolution possibilities. (members.climber.com)