Your best bet,which you already know is to stick to the facts and let the service rep,or manager do the volunteering until such time as You,as her agent and friend inspect the car and decide otherwise,then he's hung on his own words.You've described this as a "dealership"so obviously they won't try any strong-arm ***** with a determined guy.
Sounds like a typical hosing they give to helpless young gals.

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