Model S allegedly spent 66 days out of service within five months of initial purchase.

Tesla Motors reportedly faces one of its first lemon-law challenges, with a lawsuit filed by Wisconsin's self-described "King of Lemon Laws."

Milwaukee attorney Vince Megna is representing the Model S owner who alleges that his electric sedan has been out of service for 66 days since it was purchased in March 2013. The car was reportedly shipped to Chicago for repairs, with a list of troubles ranging from faulty door handles to issues with the battery cooling system.

Wisconsin state law reportedly grants owners the right to return a new car for a full refund if it has been in the shop for 30 days or more within the first year and still under warranty. Megna suggests Tesla is attempting to skirt state laws by forcing buyers to sign a restrictive purchase agreement that the company may use to demand arbitration --avoiding a formal lawsuit -- and restrict owners from talking publicly about any settlements.

"Tesla's the first company in the world that makes you sign a confidentiality agreement when you buy the car," Megna says in his quirky YouTube video.

The Model S owner in the lawsuit claims to have not received any response from Tesla after asking for a refund three times late last year. Megna appears to be confident that Wisconsin state law will supersede the signed sales contract and force the company to provide a full refund.