I have a Menard's "Vetter Sash & Door Co." structure. I love the size and detailing of the building. A while ago, the two window fans stopped rotating. I can hear what I believe is the motor still operating inside the building. This leads me to believe that the gear or belt that turns the fans has become disengaged or has broken. Is there any way to repair the problem? I am reluctant to send the building back to Menards since it has been installed in a fully-sceniced area, and the cost of shipping is likely very high. Thanks for your advice.